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English definition of “trigger”

trigger

noun [C]  /ˈtrɪɡ·ər/ us  

trigger noun [C] (GUN PART)

a part of a gun that causes the gun to fire when pressed: to pull the trigger

trigger

verb [T]  /ˈtrɪɡ·ər/ us  

trigger verb [T] (START)

to cause something to start: I triggered the smoke alarm when I burned the potatoes. Eating chocolate can trigger a migraine headache in some people.
(Definition of trigger from the Cambridge Academic Content Dictionary © Cambridge University Press)
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