1 informal an extremely easy task:the program was a cinch to use
chiefly North American a sure thing; a certainty:he was a cinch to take a prize
2chiefly North American a girth for a Western saddle or pack of a type used mainly in Mexico and the western US:they watered the horses and loosed the cinches
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Universal
1secure (a garment) with a belt:my cut-offs are cinched by a belt
fix (a saddle) securely by means of a girth:when I caught up with him he was cinching up the saddle on Rose
2 informal make certain of:his advice cinched her decision to accept the offer