cinch

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A girth for a pack or saddle.
• noun An encircling cord, band, or belt.
• noun Something easy to accomplish. synonym: breeze.
• noun A sure thing; a certainty.
• intransitive verb To put a saddle girth on (a horse).
• intransitive verb To secure (a saddle) by means of a cinch.
• intransitive verb To encircle or wrap tightly.
• intransitive verb To tighten (an encircling cord or belt, for example).
• intransitive verb Informal To make certain; secure or guarantee.
• intransitive verb To tighten an encircling band or saddle girth. Often used with up.

from The Century Dictionary.

• To gird with a cinch.
• Hence To bind or subdue by force.
• To tighten the cinch: used with up.
• noun A saddle-girth made of leather, canvas, or woven horsehair.
• noun A firm hold or grip on anything.
• noun A fine position or situation; an easy job; a ‘snap.’
• noun A variety of all-fours, sometimes called double pedro and high-five.

from the GNU version of the Collaborative International Dictionary of English.

• noun West. U. S. A strong saddle girth, as of canvas.
• noun colloq. A tight grip.
• transitive verb Western U. S. To put a cinch upon; to girth tightly.
• transitive verb Slang, U. S. To get a sure hold upon; to get into a tight place, as for forcing submission.
• intransitive verb Western U. S. To perform the action of cinching; to tighten the cinch; -- often with up.
• transitive verb In the game of cinch, to protect (a trick) by playing a higher trump than the five.
• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A simple saddle girth used in Mexico.
• noun informal Something that is very easy to do.
• noun informal A firm hold.
• verb To bring to certain conclusion.
• verb To tighten down.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun stable gear consisting of a band around a horse's belly that holds the saddle in place
• verb tie a cinch around
• verb make sure of
• noun any undertaking that is easy to do
• verb get a grip on; get mastery of
• noun a form of all fours in which the players bid for the privilege of naming trumps