1 [sinch]
a strong girth used on stock saddles, having a ring at each end to which a strap running from the saddle is secured.
a firm hold or tight grip.
something sure or easy: This problem is a cinch.
a person or thing certain to fulfill an expectation, especially a team or contestant certain to win a sporting event: The Giants are a cinch to win Sunday's game.
verb (used with object)
to gird with a cinch; gird or bind firmly.
Informal. to seize on or make sure of; guarantee: Ability and hard work cinched her success.

1855–60, Americanism; < Spanish cincha < Latin cingula girth, equivalent to cing(ere) to gird + -ula -ule Unabridged


2 [sinch]
noun Cards.
a variety of the game all fours.

1885–90; perhaps < Spanish cinco five, a card game Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cinch1 (sɪntʃ)
1.  slang an easy task
2.  slang a certainty
3.  (US), (Canadian) Also called (in Britain and certain other countries): girth a band around a horse's belly to keep the saddle in position
4.  informal a firm grip
5.  (US), (Canadian) (often foll by up) to fasten a girth around (a horse)
6.  informal (tr) to make sure of
7.  informal (tr) to get a firm grip on
[C19: from Spanish cincha saddle girth, from Latin cingula girdle, from cingere to encircle]

cinch2 (sɪntʃ)
a card game in which the five of trumps ranks highest
[C19: probably from cinch1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1859, Amer.Eng., "saddle-girth," from Sp. cincha "girdle," from L. cingulum "a girdle," from cingere "to surround, encircle," from PIE base *kenk- "to gird, encircle." Sense of "an easy thing" is 1898, via notion of "a sure hold" (1888). The verb is first recorded 1866.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Easy-to-access caves spread across the region make spelunking a cinch.
They're easy to ride, a cinch to store and dirt cheap to run.
The interface is easy to learn and creating a fun design is a cinch.
While it had its drawbacks, it also had the advantage of being durable, easy to
  customize and a cinch to repair.
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