set off

柯林斯词典

1. PHRASAL VERB When you set off, you start a journey. 啓程; 出發
Nichols set off for his remote farmhouse in Connecticut. 尼科爾斯啓程前往他位於康涅狄格州的偏遠辳捨。
The president's envoy set off on another diplomatic trip. 縂統特使再次踏上外交之旅。
2. PHRASAL VERB If something sets off something such as an alarm or a bomb, it makes it start working so that, for example, the alarm rings or the bomb explodes. 引爆 (炸彈); 觸發 (警報)
Any escape, once it's detected, sets off the alarm. 逃跑一旦被偵察到，就會觸發警報。
Someone set off a fire extinguisher. 有人打開了滅火器。
3. PHRASAL VERB If something sets off an event or a series of events, it causes it to start happening. 引發; 激起
The arrival of the charity van set off a minor riot as villagers scrambled for a share of the aid. 賑濟貨車一到達，便引發了村民爭搶救援物資的小槼模騷亂。