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Phrase(s): Silence gives consent.
Prov. If you do not object to what someone says or does, you can be assumed to agree with or condone it. • Jill: What did Fred say when you told him we were thinking about leaving the office early? Jane: He didn’t say anything. Jill: Then he must not mind if we go. Silence gives consent.
McGrawhill's American Idioms And Phrasal Verbs