1reporting verb Complain about something in a bad-tempered way.with clause ‘his father was grumbling that he hadn't heard from him’complain, moan, groan, whine, mutter, grouse, bleat, carp, cavil, protestView synonyms
2no object Make a low rumbling sound.‘thunder was grumbling somewhere in the distance’
3no object (of an internal organ) give intermittent discomfort.‘my appendix grumbled for years before it finally got serious’
1A complaint.‘the main grumble is that he spends too much time away’complaint, moan, groan, whine, muttering, grievance, objection, protest, protestation, cavil, quibble, criticism, charge, accusationView synonyms
2A low rumbling sound.‘in the distance, I heard a grumble of thunder’
Late 16th century from obsolete grumme (probably of Germanic origin and related to Dutch grommen) + -le.