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set off

phrasal verb
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set off
  1. 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
  1. 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。🔊🔊
  2. 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。🔊🔊
  3. 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
  4. 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)
  1. to make somebody start doing something such as laughing, crying or talking使某人笑（或哭、说等）起来