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  1. a person given to constant complaining.
  2. Informal. the grumps, a depressed or sulky mood.
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verb (used without object)
  1. to complain or sulk.
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Origin of grump

First recorded in 1835–45; probably back formation from grumpy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for grump


  1. a surly or bad-tempered person
  2. (plural) a sulky or morose mood (esp in the phrase have the grumps)
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  1. (intr) to complain or grumble
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Word Origin

C18: dialect grump surly remark, probably of imitative origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for grump


"ill-humor," 1727, in humps and grumps "surly remarks," later the grumps "a fit of ill-humor" (1844), then "a person in ill humor" (1900); perhaps an extended sense of grum "morose, surly," which probably is related to Danish grum "cruel;" or perhaps suggested by grumble, grunt, etc.

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Online Etymology Dictionary, © 2010 Douglas Harper