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

(also wouldn't know sth if it hit you in the face) informal

Definition

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)