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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. US (UK not say boo to a goose) informal to be very nervous and easily frightened
(Definition of not say boo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “not say boo”

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