- grumble (v.)
- 1580s, from Middle French grommeler "mutter between the teeth" or directly from Middle Dutch grommelen "murmur, mutter, grunt," from grommen "to rumble, growl." Imitative, or perhaps akin to grim. Related: Grumbled; grumbling.
- grumble (n.)
- 1620s, from grumble (v.).