cinch的意思是：很容易的事；小菜。It's a cinch的意思就是小菜一碟，小事一桩，简单的很。

【例句】
Don't worry. It's a cinch. I'll have the files ready by Friday.
别担心，这是小事一桩。周五前我会把资料准备好。

I can climb that rock wall, it's a cinch.
我能爬上那面石墙，轻而易举的事。