• IPA: /ɡɹʌmp/

grump (plural grumps)

1. (informal) A habitually grumpy or complaining person.
2. (informal) A grumpy mood.
   • 2004, Toby Chapman-Dawe, Passport to Performance: Raise Your Business Performance!, page 29:

     If you're not taking Action to change the situation, either sit in a grump or Accept it.

grump (grumps, present participle grumping; simple past and past participle grumped)

1. (informal, intransitive) To complain.
   • 1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, →OCLC ↗, page 72:

     Grumping to himself as he made up his own bed, Bradly thought, "Have to wash that blanket; young blighter going to bed with all that mud on his feet."

2. (informal, intransitive) To be grumpy.

• French: ronchonner