tailspin ['teilspin]

1.急剧下滑（名词，非正式用语）；

2.飞机快速下坠（名词）

1. (noun,INFORMAL) A period of severe decline that will lead to failure.

2. (noun) An airplane’s rapid, spiral descent.

EXAMPLE 1: When the founder of our company died and most of our managers took jobs with our competitors, our business went into a tailspin.

我们公司的创始人去世，大部分经理转投竞争对手，我们的业务一落千丈。

EXAMPLE 2: When its rudder broke, the small airplane went into a tailspin and crashed.

这架小飞机的方向舵断了，它迅速坠毁。

to wrap something up

收尾

Informal expression meaning to finish the remaining aspects of something, such as a task, so it is fully completed.

EXAMPLE: The long project is nearly finished and I think we can wrap it up next week.

这个长期项目基本完成，我想下周我们就可以收尾了。