Grump Definition
grŭmp
grumps
noun
grumps
A fit of bad humor.
Webster's New World
A grumpy person.
Webster's New World
verb
grumps
To complain and grumble.
Webster's New World
To behave in a grumpy manner.
American Heritage
(intransitive) To be grumpy.
Wiktionary
Origin of Grump
Origin unknown
From American Heritage Dictionary of the English Language, 5th Edition
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