... strap) tightly 2. to make certain ; assure < the goal that cinched the victory > intransitive verb to tighten the cinch — often used ... pack. --v.tr. 1 a tighten as with a cinch (cinched at the waist with a belt). b secure a grip ... s 1913 Dictionary Cinch Cinch, v. t. [imp. & p. p. Cinched; p. pr. & vb. n. Cinch"ing.] 1. To put a ...