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Definition of keep mum:

Synonyms for keep mum:

fold, obstruct, lock up, occlude, lock away, be quiet, jam, put away, obturate, shut down, button up, impede, dummy up, still, block, shut away, hush, shut up, silence, hush up, dummy, close, belt up, clam up, quieten, close up, lock, close down, lock in.