cinch 1
/sinch/ , n.
1. a strong girth used on stock saddles, having a ring at each end to which a strap running from the saddle is secured.
2. a firm hold or tight grip.
3. Informal.
a. something sure or easy: This problem is a cinch.
b. a person or thing certain to fulfill an expectation, esp. a team or contestant certain to win a sporting event: The Giants are a cinch to win Sunday's game.
v.t.
4. to gird with a cinch; gird or bind firmly.
5. Informal. to seize on or make sure of; guarantee: Ability and hard work cinched her success.
[ 1855-60, Amer.; cincha cingula girth, equiv. to cing ( ere ) to gird + -ula -ULE ]
cinch 2
/sinch/ , n. Cards.
a variety of the game all fours.
[ 1885-90; perh. cinco five, a card game ]