1. Expression：slack off

Explanation 1：To release or ease the tension or pressure (on something). （释放或缓解紧张和压力，放松休息）

Example：I'll need to slack off a bit so that I can continue with my work.

我需要休息一会儿，这样才能继续工作。

I should have been working on my essay but I decided to slack off for the weekend with my friends.

我本应该致力于我的论文，但是我决定和我的朋友周末放松一下。

After intense work in the summer, we 'll be slack off now .

夏季紧张的工作过后，我们现在放松了。

2. Expression：slack off

Explanation ：To be or become lazy; to procrastinate or avoid work or one's duty. （懈怠，懒惰对待工作或任务）

Example：If you keep slacking off, we'll be forced to give you a formal warning.

如果你继续偷懒，我们将不得不正式警告你。

Near the end of the school year, Sally began to slack off and her grades showed it.

学年快结束时，Sally开始懈怠，她的成绩显示了这一点。

John got fired for slacking off during the busy season.

约翰因为在旺季偷懒而被解雇了。

I didn't slack off but I developed a sort of cocky confidence that I had never experienced in my first three years of college.

我没有松懈，但我养成了一种大学前三年从没有过的骄傲自信的心态。