Language is not only about grammar and vocabulary—it is also full of expressions that native speakers use every day.
These expressions are called idioms, and they often have meanings that are different from the literal meaning of the words.
Learning idioms is an important step for anyone who wants to sound natural and fluent in English.
Idioms related to not understanding are especially useful because confusion happens frequently in conversations,
classrooms, meetings, and daily life. Instead of simply saying “I don’t understand,” native speakers often use creative phrases that make communication more expressive and natural.
These idioms help you describe confusion, misunderstanding, or difficulty grasping an idea in a more engaging way.
Mastering idioms for confusion, phrases for misunderstanding, and English expressions for not understanding can improve your speaking,
writing, and listening skills. Whether you are preparing for exams like IELTS, improving workplace communication,
or simply trying to speak English more naturally, these idioms will help you express uncertainty with clarity and confidence.
In this guide, you will explore 13 powerful idioms, learn when to use them, and practice applying them in real-life situations.
Quick Overview Table
| Idiom | Short Meaning | Tone | Common Use Context |
|---|---|---|---|
| Go over someone’s head | Too difficult to understand | Neutral | Education, work |
| Draw a blank | Suddenly unable to remember or understand | Informal | Conversation, exams |
| Not sink in | Information not fully understood | Neutral | Learning situations |
| Be lost on someone | Someone fails to understand something | Neutral | Humor, explanations |
| Can’t make heads or tails of it | Completely confused | Informal | Complex problems |
| Greek to me | Totally incomprehensible | Informal | Difficult topics |
| Miss the point | Fail to understand the main idea | Neutral | Discussion |
| Not click | Something fails to become clear | Informal | Learning |
| Go in one ear and out the other | Information not retained | Informal | Advice or lectures |
| Be in the dark | Lacking knowledge or understanding | Neutral | Professional context |
| Not register | Information not mentally processed | Neutral | Serious discussions |
| Be puzzled by | Feel confused about something | Neutral | Everyday use |
| Be at sea | Completely confused about a situation | Slightly formal | Professional or academic |
Detailed Idioms Section
Go Over Someone’s Head
Meaning:
An idea or explanation is too complex for someone to understand.
When to Use It:
Use this idiom when information is too advanced or technical for the listener.
Example Sentence:
The professor’s explanation of quantum physics went over my head.
Similar Expressions:
Too complicated to grasp, hard to follow
Opposite Expression:
Crystal clear
Draw a Blank
Meaning:
To suddenly be unable to remember or understand something.
When to Use It:
Common during tests, interviews, or presentations when your mind suddenly stops working.
Example Sentence:
When the teacher asked me the formula, I completely drew a blank.
Similar Expressions:
Mind goes blank, forget completely
Opposite Expression:
Remember instantly
Not Sink In
Meaning:
Information has been heard but not fully understood or accepted yet.
When to Use It:
Useful when someone needs time to process new information.
Example Sentence:
The instructions didn’t sink in until I tried the task myself.
Similar Expressions:
Take time to understand, slowly realize
Opposite Expression:
Understand immediately
Be Lost on Someone
Meaning:
An idea, joke, or explanation fails to be understood by someone.
When to Use It:
Often used when humor or subtle meaning is not recognized.
Example Sentence:
The sarcasm in his comment was completely lost on her.
Similar Expressions:
Fail to understand, not catch the meaning
Opposite Expression:
Get the point
Can’t Make Heads or Tails of It
Meaning:
To be completely unable to understand something.
When to Use It:
Used when something seems extremely confusing or unclear.
Example Sentence:
I read the instructions twice but still couldn’t make heads or tails of them.
Similar Expressions:
Totally confused, impossible to figure out
Opposite Expression:
Make perfect sense
Greek to Me
Meaning:
Something that is completely incomprehensible.
When to Use It:
Used humorously when a subject is too difficult.
Example Sentence:
Accounting formulas are Greek to me.
Similar Expressions:
Impossible to understand, beyond me
Opposite Expression:
Easy to understand
Miss the Point
Meaning:
Fail to understand the main idea of something.
When to Use It:
Common in discussions, debates, or presentations.
Example Sentence:
You’re missing the point of the argument.
Similar Expressions:
Misunderstand the idea, overlook the message
Opposite Expression:
Understand the main idea
Not Click
Meaning:
When something does not suddenly become clear.
When to Use It:
Often used when learning new concepts.
Example Sentence:
The math problem didn’t click until my teacher explained it differently.
Similar Expressions:
Not make sense yet, fail to connect
Opposite Expression:
Everything clicks
Go in One Ear and Out the Other
Meaning:
Information is heard but immediately forgotten or ignored.
When to Use It:
Common with advice or instructions.
Example Sentence:
My parents’ warnings went in one ear and out the other.
Similar Expressions:
Ignore advice, forget immediately
Oppposite Expression:
Take something to heart
Be in the Dark
Meaning:
To lack knowledge or understanding about a situation.
When to Use It:
Often used in workplace or professional contexts.
Example Sentence:
Employees were kept in the dark about the company changes.
Similar Expressions:
Uninformed, unaware
Oppposite Expression:
Be fully informed
Not Register
Meaning:
Information fails to make an impact or be mentally processed.
When to Use It:
Common in emotional or surprising situations.
Example Sentence:
The bad news didn’t register at first.
Similar Expressions:
Not process, fail to realize
Opposite Expression:
Immediately understand
Be Puzzled By
Meaning:
To feel confused or uncertain about something.
When to Use It:
Used when something seems strange or difficult to explain.
Example Sentence:
Scientists were puzzled by the unusual results.
Similar Expressions:
Be confused by, wonder about
Opposite Expression:
Clearly understand
Be at Sea
Meaning:
To feel completely confused or unsure about what to do.
When to Use It:
Often used in academic or professional situations.
Example Sentence:
Without clear instructions, the new employees were at sea.
Similar Expressions:
Completely confused, uncertain
Opposite Expression:
Know exactly what to do
Categorizing the Idioms
Idioms for Difficult Situations
- Can’t make heads or tails of it
- Greek to me
- Be at sea
- Go over someone’s head
Funny or Informal Idioms
- Greek to me
- Draw a blank
- Go in one ear and out the other
- Not click
Formal or Professional Idioms
- Be in the dark
- Miss the point
- Not register
- Be puzzled by
How to Use These Idioms in Real Conversations
Workplace Example
During a meeting, you might say:
“Sorry, the technical explanation went over my head. Could you simplify it?”
Casual Conversation Example
A friend explaining cryptocurrency might hear:
“Honestly, all these trading terms are Greek to me.”
Writing Example (Email)
“I reviewed the report, but some sections are still unclear and I can’t quite make heads or tails of the data.”
IELTS / Exam Tip
Using idioms naturally in speaking tasks can improve fluency scores. However, avoid forcing them—use them only when they fit the situation.
Common Mistakes to Avoid
Literal Interpretation
Idioms should never be interpreted word-for-word. For example, “Greek to me” has nothing to do with the Greek language.
Using Informal Idioms in Formal Writing
Expressions like “go in one ear and out the other” may sound too casual in academic essays.
Tone Misuse
Some idioms are humorous, while others are neutral. Choosing the wrong tone can make communication awkward.
Practice Exercise
Fill in the Blank
- The lecture completely went ______ my head.
- When the teacher asked the answer, I ______ a blank.
- The joke was completely ______ on him.
- These financial terms are ______ to me.
- Without clear instructions, I felt ______ at sea.
- His explanation didn’t ______ yet.
- The message went in one ear and out the ______.
- I can’t make ______ or tails of this manual.
- The news didn’t ______ at first.
- She completely ______ the point of the discussion.
Multiple Choice
- Which idiom means “completely confusing”?
a) Be at sea
b) Draw a blank
c) Miss the point - Which idiom describes forgetting instantly?
a) Not click
b) Go in one ear and out the other
c) Be puzzled by - Which idiom fits professional situations?
a) Be in the dark
b) Greek to me
c) Draw a blank - Which idiom means “fail to understand the main idea”?
a) Miss the point
b) Be at sea
c) Not sink in - Which idiom means “too complex to understand”?
a) Go over someone’s head
b) Not register
c) Draw a blank
Writing Prompts
- Write a short paragraph about a time when something “went over your head.”
- Describe a confusing school subject using one idiom from the list.
- Write a short dialogue using “Greek to me.”
Answers
Fill in the blanks
- over
- drew
- lost
- Greek
- completely
- click
- other
- heads
- register
- missed
Multiple Choice
- a
- b
- a
- a
- a
FAQs
What are idioms for not understanding?
They are expressions used to describe confusion, misunderstanding, or difficulty grasping an idea in conversation.
Why should English learners study idioms?
Idioms help learners sound more natural and improve comprehension when listening to native speakers.
Are idioms suitable for formal writing?
Some idioms work in professional communication, but many are better suited for casual conversation.
How can I remember idioms easily?
Practice them in sentences, conversations, and writing rather than memorizing them as isolated phrases.
Do idioms appear in English exams like IELTS?
Yes, idioms often appear in listening sections and can improve fluency in the speaking test when used appropriately.
Conclusion
Learning idioms related to not understanding is an excellent way to improve both your fluency and comprehension in English.
Instead of repeating the basic phrase “I don’t understand,” you can use expressive idioms like go over someone’s head, draw a blank, or Greek to me to communicate more naturally.
These expressions appear frequently in everyday conversations, workplaces, classrooms, and even professional discussions.
By understanding the tone and context of each idiom, you can choose the right phrase for the right situation.
The key to mastering idioms is consistent exposure and practice. Try using them in conversations, writing exercises, or while preparing for English exams.
Over time, these expressions will become a natural part of your vocabulary and help you sound more confident and fluent in English
Corvin Hale is a language enthusiast who makes learning English idioms simple and fun.
