英文成語call it a day

Idiom: call it a day (今天到此為止；結束一天的工作---非正式用法)

Meaning: If you call it a day, you stop doing something that's usually related to work.

For example:

• We couldn't do any more work because of the rain, so we called it a day and went home. 因為下雨我們無法再做任何工作，所以就到此結束回家去了。
• I'm tired. Let's call it a day. 我累了。今天就到此結束吧! 

Reference: Englishclub.com   Yahoo奇摩字典