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Definition of cinch : 1. A strong saddle girth, as of canvas.
2. A tight grip.
3. A variety of auction pitch in which a draw to improve the hand is added, and the five of trumps ( called right pedro) and the five of the same color ( called left pedro, and ranking between the five and the four of trumps) each count five on the score. Fifty- one points make a game. Called also double pedro and high five.
4. In the game of cinch, to protect ( a trick) by playing a higher trump than the five.
5. To get a sure hold upon; to get into a tight place, as for forcing submission.
6. To perform the action of cinching; to tighten the cinch; - often with up.
7. To put a cinch upon; to girth tightly.

Synonyms:

snap bean, warrant, gentle wind, sure thing, ginger nut, picnic, certainty, lead-pipe cinch, walkover, setup, guarantee, ginger snap, pushover, insure, secure, outing, assure, cracking, piece of cake, crack, snap fastener, snapshot, ensure, certain, duck soup, zephyr, shoo-in, breeze, child's play, field day, air, walkaway, grab, snatch, gingersnap, centering, girth, play, easy, true, press stud, foregone conclusion, shot, elasticity

fastener (part of speech: noun)

hasp, cotter, brace, knitting, stay, anchor, bracket, nail, glue, hinge, spike, vinculum, lace, hitch, snap, tie, link, belt, paste, grapnel, hook, cincture, medium, coupling, stitch, fastening, middleman, guy, clinch, fuse, rivet, staple, thread, suture, cleat, connector, string, band, agent, chain, buckle, weld, seal, pin, catch, braid, lock, clasp, twine, hawser, rabbet, binding, ligament, clip, mediator, brad, clamp, fastener, latch, bonding, splice, zipper, closure, binder, bolt, skewer, tack, strap, knot, mucilage, bond, vise, button, go-between, cement

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