set off

phrasal verb

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set off

to begin a journey出发；动身；启程
- We set off for London just after ten.刚过十点，我们就动身上伦敦去了。

set something off

to make a bomb, etc. explode使（炸弹等）爆炸
- A gang of boys were setting off fireworks in the street.一帮男孩子正在街上放烟火。
to make an alarm start ringing使（警报）响起；拉响（警报）
- Opening this door will set off the alarm.一开这道门，警铃就会响。
to start a process or series of events引发；激起
- Panic on the stock market set off a wave of selling.股市恐慌引发了一轮抛售潮。
Topics Change, cause and effectc2
to make something more attractive or easy to notice by being placed near it衬托；使显得更突出（或更漂亮）
- That blouse sets off the blue of her eyes.那件上衣衬托出了她的蓝眼睛。

set somebody off (doing something)

to make somebody start doing something such as laughing, crying or talking使某人笑（或哭、说等）起来