Etymology
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clobber (v.)

"to hit hard, defeat decisively," 1941, British air force slang, of unknown origin, probably related to bombing; possibly echoic. Related: Clobbered; clobbering.

In late 19c. British slang an identical word principally had to do with clothing, as in clobber (n.) "clothes," (v.) "to dress smartly;" clobber up "to patch old clothes for reuse, conceal defects" (1851). The source of these seems to have been 19c. clobber (n.) "kind of coarse dark paste used to cover breaks in leather in old shoes," which seems similar to Gaelic clabar "mud," but OED writes that this is "hardly likely to be the word."

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Definitions of clobber
1
clobber (v.)
strike violently and repeatedly;
She clobbered the man who tried to attack her
Synonyms: baste / batter
clobber (v.)
beat thoroughly and conclusively in a competition or fight;
Synonyms: cream / bat / drub / thrash / lick
2
clobber (n.)
informal terms for personal possessions;
did you take all your clobber?
Synonyms: stuff
From wordnet.princeton.edu