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English definition of “not say boo”

not say boo

US informal to say nothing: You didn't say boo to me about going to your mother's this weekend .Not saying muchBlunt and direct in speech and behaviourNot being friendlyDigressing and being indirect or evasive US (UK not say boo to a goose) informal to be very nervous and easily frightened Shy and modestAnxious and worriedAnxious and worried
(Definition of not say boo from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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