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mum's the word · one's lips are sealed
to keep one's mouth shut, one's lips are sealed (to not reveal a secret)
köken: Literally, “to keep one's mouth on a padlock”.
one’s lips are sealed
köken: From lakat (“padlock”) + van (“is”) + a (“the”) + száján (“on his/her mouth”), literally, “there is a padlock on his/her mouth”.