1. drop a bombshell 宣布惊人的消息

To announce shocking or startling news

e.g. They really dropped a bombshell when they announced that the mayor would resign.

2. drop the ball 犯错误，失败

To make a blunder； to fail in some way

e.g. Everything was going fine at work until my manager dropped the ball.

3. drop names 谈话中套用名人的名字来拔高自己

To mention the names of important or famous people as if theyre close friends

e.g. Mary always tries to impress people by dropping the name of some big-time executives she claims to know.

4. wait for the other shoe to drop 等待下一步，等待最终的结果

To wait for the inevitable next step or the final conclusion

e.g. Ever since my wife caught me cheating Ive been waiting for the other shoe to drop.

5. drop everything 放下手头上所有的事情，抛下一切

To stop doing whatever you are doing

e.g. Do you expect me to just drop everything to come and pick you up at school？