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Knowledge & Understanding - Lack of Understanding

Explore English idioms regarding a lack of understanding with examples like "clear as mud" and "make head or tail of".

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English idioms related to Knowledge & Understanding
to [use] {one's} [head|noodle|naggin]

to carefully consider the facts of a situation in order to understand something, make a decision, or solve a problem

Ex: Use your head before you sign anything. 
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out of {one's} depth

in a very nervous or frustrating state of mind in face of a problem or situation one knows very little or nothing about

Ex: After the first week in the new role, I felt completely out of my depth. 
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your guess is as good as mine

said when one does not have a definite answer to a particular question, similar to the questioner

Ex: When will the power come back? Your guess is as good as mine. 
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to [get|have] the wrong end of the stick

to fail to understand or interpret or understand something correctly

Ex: I think you've got the wrong end of the stick; I never said we were cancelling the trip. 
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to {not} [know] beans about {sth}

to have no information regarding a particular subject

Ex: I don't know beans about cars, so I always ask a mechanic before buying one. 
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for the life of {sb}

used when one is incapable of understanding or remembering a particular thing

Ex: I can't for the life of me remember where I put my keys. 
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closed book

someone or something one knows very little or nothing about

Ex: Advanced physics is a closed book to me. 
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(as|) clear as mud

used to describe something that is complicated due to not being clearly described or shown

Ex: The instructions were clear as mud, so nobody knew what to do next. 
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{not} [know] {one's} ass from {one's} elbow

to be incapable of understanding even the simplest concepts

Ex: Don't ask him to set up the printer; he doesn't know his ass from his elbow when it comes to computers. 
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final frontier

the limits of human knowledge or understanding, representing areas that remain unknown or unexplored

Ex: For many scientists, consciousness remains the final frontier. 
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in a fog
in a fog
[phrase]

confused and unable to think clearly

Ex: After the long flight, I was in a fog and could barely answer simple questions. 
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to [wrap] {one's} [head|mind|brain] around {sth}

to fully understand something difficult, complicated, or strange

Ex: I still can't wrap my head around how quickly everything changed. 
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to [make] head or tail (out|) of {sb/sth}

to make an attempt to understand someone or something that is puzzling

Ex: I read the report twice, but I still couldn't make head or tail of it. 
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