Something that is extremely easy to do, or a tight grip or belt; the act of tightening something securely.
From Spanish 'cincha' (saddle girth), derived from Latin 'cingula' (belt), originally a horseback-riding term for a tight strap used to secure a saddle.
A 'cinch' as 'easy task' comes from cowboy terminology—if a horse's saddle cinch was tight (secure and difficult to loosen), the connection was strong, so a 'cinch deal' meant something rock-solid and dependable.
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