Etymology
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cinch (n.)

1859, American English, "saddle-girth," from Spanish cincha "girdle," from Latin cingulum "a girdle, a swordbelt," from cingere "to surround, encircle," from PIE root *kenk- (1) "to gird, encircle" (source also of Sanskrit kankate "binds," kanci "girdle;" Lithuanian  kinkau, kinkyti "to harness horses"). Replaced earlier surcingle. Sense of "an easy thing" is 1895 (in lead-pipe cinch), via notion of "a firm or sure hold" (1888).

cinch (v.)

1866, "to pull in, gird with or as with a cinch," from cinch (n.). Figurative meaning "make certain" is from 1891, American English slang, via Western U.S. colloquial sense "bind or subdue by force" (1875). Related: Cinched; cinching.

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Definitions of cinch
1
cinch (v.)
tie a cinch around;
cinch horses
Synonyms: girth
cinch (v.)
make sure of;
cinch (v.)
get a grip on; get mastery of;
2
cinch (n.)
any undertaking that is easy to do;
Synonyms: breeze / picnic / snap / duck soup / child's play / pushover / walkover / piece of cake
cinch (n.)
stable gear consisting of a band around a horse's belly that holds the saddle in place;
Synonyms: girth
cinch (n.)
a form of all fours in which the players bid for the privilege of naming trumps;
From wordnet.princeton.edu