grump

Uncertain. Possibly altered from grum, see there for more.[1]

• IPA^(key): /ɡɹʌmp/

• Audio (US)

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• Rhymes: -ʌmp

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 (third-person singular simple present 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.