Meaning of “not know the first thing about sth” in the English Dictionary

british dictionary

"not know the first thing about sth" in British English

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not know the first thing about sth

to know nothing about a subject:

I'm afraid I don't know the first thing about car engines.

(Definition of “not know the first thing about sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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