Webster's English Dictionary

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cinch

1. cinch \'sinch\ n [Sp cincah, fr. L cingula girdle, girth, fr. cingere] 
   1: a strong girth for a pack or saddle  2: a tight grip  3a: a thing done 
   with ease  3b: a certainty to happen 
2. cinch vt 1: to put a cinch on  2: to make certain : ASSURE