Found 1 items, similar to Mum's the word.
English → English (gcide) Definition: mum's the word Mum \Mum\, a. [Of imitative origin. Cf. Mumble.] Silent; not speaking; as, to keep mum. --Thackeray. [1913 Webster] The citizens are mum, and speak not a word. --Shak. [1913 Webster] mum's the word keep this a secret; don't tell anybody. [PJC]