Meaning of “not say boo” in the English Dictionary

british dictionary

"not say boo" in British English

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not say boo

US informal to say nothing:

You didn't say boo to me about going to your mother's this weekend.

US also be afraid to say boo, UK not say boo to a goose informal to be very nervous and easily frightened

(Definition of “not say boo” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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