有了他的帮助，这次项目成功是十拿九稳的事。

With his help, the success of this project is a ___cinch.

牛仔检查了马鞍的肚带，确保它们都系紧了。

The cowboy checked the ___cinches to make sure they were securely fastened.

他的出色表现确保了我们赢得比赛。

His outstanding performance ___cinched our victory in the game.