Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A cranky complaining person.
- n. A fit of ill temper. Often used in the plural with the.
- v. To mutter complaints.
- v. To behave in a grumpy manner.
Wiktionary
- n. a habitually grumpy or complaining person
- v. to complain
- v. to be grumpy
WordNet 3.0
- n. a bad-tempered person
Etymologies
- Origin unknown.
Examples
“My biggest grump is that I checked it out of a library.”
“He considered himself an old-fashioned "grump" who was skeptical (in a humorous way) about many contemporary aspects of life.”
Michael Markarian: The Life of Cleveland Amory: Q&A with Marilyn Greenwald
“-- To "grump" and "bill", who conclude that the RESPONSIBILITY for Bhutto's assassination rests with the Bush administration (and not with those extremists who actually planned and carried out the attack), you actually come off sounding like NeoCons!”
Rudy: Bhutto's Assassination Is Reminder That You Should Elect Me President
“In another moment both "grump" and "squeal" were repeated in full chorus by a drove of wild pigs that burst suddenly out of a thick bush, and, rushing in mad haste past the intruders on their domain, disappeared, yelling, into a neighbouring thicket.”
“Though he's a self-professed "grump," he's also a very entertaining writer and someone I wouldn't mind sharing a beer with.”
“I try to keep the grump in me at bay, but it's a struggle.”
“And now, rant over, I am heading for bed to sleep off the last of my grump and head back into the trenches of the week.”
“Tomorrow is a “real” rest day so I will enjoy the snow then! grump over. on January 7, 2010 at 10: 23 pm ambulanceamateur”
The Smooth And Efficient Running Of A Police Station « POLICE INSPECTOR BLOG
“Page 13 (story page 1) -- I hate to sound like a grump, but in the old days the Green Lantern rings were limited only by the wearer's willpower (and, when applicable, the color yellow).”
“Aside from being in a bit of a grump this morning, which is just transitory and pretty normal really, things are really good in my life.”

brtom Sunday slipping astern in the spyboat, me diddling the knurls of the focal knobs, in a grump.
John Latta, Isola di Rifiuti Jan 9, 2007