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Từ điển Oxford Advanced Learner 8th
trigger
trig·ger AW [trigger triggers triggered triggering] noun, verb BrE [ˈtrɪɡə(r)] NAmE [ˈtrɪɡər]
noun
1. the part of a gun that you press in order to fire it
•to pull/squeeze the trigger
•He kept his finger on the trigger.
2. ~ (for sth) | ~ (to sth/to do sth) something that is the cause of a particular reaction or development, especially a bad one
•The trigger for the strike was the closure of yet another factory.
•Intense sunlight may be a trigger to skin cancer.
3. the part of a bomb that causes it to explode
•nuclear triggers
Word Origin:
early 17th cent.: from dialect tricker, from Dutch trekker, from trekken ‘to pull’.
verb
1. ~ sth (off) to make sth happen suddenly
Syn: ↑set off
•Nuts can trigger off a violent allergic reaction.
2. ~ sth to cause a device to start functioning
Syn: ↑set off
•to trigger an alarm
Verb forms: 
Word Origin:
early 17th cent.: from dialect tricker, from Dutch trekker, from trekken ‘to pull’.
Example Bank:
•A wide range of emotionally stressful events may trigger a relapse.
•An influx of refugees has triggered disturbances.
•Even the smell of oranges can trigger her migraine.
•He suffers from a brain disorder that can trigger off convulsive fits.
•The burglars fled after triggering the alarm.
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