a person or thing that spoils or dampens the pleasure of others.

1965–70; from the Grinch, name of a character created by Dr. Seuss (Theodor Seuss Geisel) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grinch (ɡrɪntʃ)
informal (US) a person whose lack of enthusiasm or bad temper has a depressing effect on others
[C20: from a character in the 1957 children's book How the Grinch stole Christmas by Dr Seuss (1904--91), US writer and illustrator, whose full name was Theodor Seuss Geisel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  grinch
Part of Speech:  n
Definition:  one who spoils the pleasure of others
Etymology:  character in How the Grinch Stole Christmas by Dr. Seuss (Theodor Geisel)
Main Entry:  grinch
Part of Speech:  v
Definition:  to make a harsh grating noise
Etymology:  French grincer's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Word Origin & History

"spoilsport;" all usages trace to Dr. Seuss' 1957 book "How the Grinch Stole Christmas."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Makes the grinch in me go away, even if only for a bit.
Don't let the credit card grinch strike while on vacation.
Don't let the credit card grinch strike while on vacation.
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