Quick definitions from WordNet (keep mum)
▸ verb: refuse to talk or stop talking; fall silent
▸ Words similar to keep mum
▸ Usage examples for keep mum
▸ Words that often appear near keep mum
▸ Rhymes of keep mum
▸ Invented words related to keep mum
▸ verb: refuse to talk or stop talking; fall silent
▸ Words similar to keep mum
▸ Usage examples for keep mum
▸ Words that often appear near keep mum
▸ Rhymes of keep mum
▸ Invented words related to keep mum