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English definition of “wouldn't know sth if you fell over one/it”

wouldn't know sth if you fell over one/it

(also wouldn't know sth if it hit you in the face) informal
used to say that someone would not recognize something even if it was obvious : She wouldn't know a bargain if she fell over one!Unaware
(Definition of wouldn't know sth if you fell over one/it from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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