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to use one's head / noodle / naggin
phrase
to carefully consider the facts of a situation in order to understand something, make a decision, or solve a problem
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out of one's depth
phrase
in a very nervous or frustrating state of mind in face of a problem or situation one knows very little or nothing about
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your guess is as good as mine
sentence
said when one does not have a definite answer to a particular question, similar to the questioner
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to get / have the wrong end of the stick
phrase
to fail to understand or interpret or understand something correctly
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to not know beans about sth
phrase
to have no information regarding a particular subject
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for the life of sb
phrase
used when one is incapable of understanding or remembering a particular thing
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closed book
/klˈoʊzd bˈʊk/
noun
someone or something one knows very little or nothing about
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(as) clear as mud
phrase
used to describe something that is complicated due to not being clearly described or shown
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not know one's ass from one's elbow
sentence
to be incapable of understanding even the simplest concepts
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in a fog
phrase
confused and unable to think clearly
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to wrap one's head / mind / brain around sth
phrase
to fully understand something difficult, complicated, or strange
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to make head or tail (out) of sb/sth
phrase
to make an attempt to understand someone or something that is puzzling
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