1
- informal an extremely easy task〈非正式〉极其容易做的事情：
the program was a cinch to use.
这个程序使用起来太容易了。
1.1
- a sure thing; a certainty必定的事; 毫无疑问的事：
he was a cinch to take a prize.
他肯定会得奖。
2
- chiefly N. Amer. a girth for a Western saddle or pack of a type used mainly in Mexico and the western US〈主北美〉（主要用于墨西哥, 美国西部的）一种类型的西部马鞍肚带。
with obj. chiefly N. Amer. <主北美>
1
- secure (a garment) with a belt用带子系（衣服）。
1.1
- fix (a saddle) securely by means of a girth; girth up (a horse).用肚带系紧（马鞍）; 给（马）系上肚带。
2
- informal make certain of〈非正式〉确保：
his advice cinched her decision to accept the offer.
他的劝告确保了她决定接受提议。
词源
mid 19th cent. (in sense 2 of the noun)： from Spanish cincha 'girth'.