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tongues wagging

informal

Definition

If what someone says or does starts tongues wagging, it causes other people to start talking and guessing things about their private lives: Do you think if we leave the party together it will set/start tongues wagging? They tried to keep their affair secret, but it wasn't long before tongues began to wag.Revealing secrets and becoming known
(Definition of tongues wagging from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)