keep (one's) lips sealed

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keep (one's) lips sealed

To not say anything (about something); to keep (something) a secret. Please keep your lips sealed about our engagement, we aren't ready to tell everybody just yet.
See also: keep, lip, seal
References in periodicals archive ?
However, the actress refused to say anything about it, believing that until contracts are signed, scripts are sent and cameras start grinding, it is best to keep one's lips sealed on such matters.