1.get the ball rolling开始 (来源：英语论坛 http://bbs.englishcn.com)

     Let's get the ball rolling.让我们开始吧。

     2.get on the ball用心做

     If you hope to keep your job, you'd better get on the ball and meet the deadline.

     如果你还想要你的那份工作，你最好用心做，赶上最后期限！

     3.lady-killer帅哥

     He's a real lady-killer. 他是个不折不扣的帅哥。

     4.lay off停止，解雇

     Lay off! I don't need you to tell me what to do!

     别再讲了!我不需要你告诉我怎么去做！

     5.knock it off=cut it off 停止

     Knock it off! I'm trying to get some sleep.

     别吵了！我正想睡觉呢！