Keep_mumWordNet ExplorerExplore synonyms, antonyms, hypernyms, hyponyms, and semantic relationships for “keep_mum” powered by Princeton WordNet.verbrefuse to talk or stop talking; fall silentWords in this synset: close_up, clam_up, dummy_up, shut_up, belt_up, button_up, be_quiet📖 Dictionary definition🌍 Word origin & etymology