The definition of a cinch is something that is very easy to do, or that is a sure thing.
(noun)To cinch is to firmly fasten or get a tight grip on something.
(verb)See cinch in Webster's New World College Dictionary
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noun
Origin: MexSp < Sp cincha < L cingulum, a girdle < cingere, to surround, encircle < IE base *kenk-, to gird, encircle > Sans káñcate, (he) binds, Gr kakala, walls
transitive verb
See cinch in American Heritage Dictionary 4
noun
Origin:
Origin: Spanish cincha
Origin: , feminine of cincho, belt
Origin: , from Latin cīnctus
Origin: , from
Origin: past participle of cingere, to gird; see kenk- in Indo-European roots
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