Synonyms of mum's the word in English:

mum's the word


See definition of mum's the word

phrase

1

SYNONYMS
say nothing, keep quiet, don't breathe a word, don't tell a soul, don't give the game away, keep it secret, keep it to yourself, keep it under your hat, play dumb
Scottish play the daft baddie, play the daft lassie
informal don't let on, keep shtum, don't let the cat out of the bag