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English definition of “trigger”

trigger

noun uk   /ˈtrɪɡ.ər/ us    //

trigger noun (GUN PART)

[C] a part of a gun that causes the gun to fire when pressed: It's not clear who actually pulled the trigger.Parts of guns

trigger noun (START)

[C usually singular] an event or situation, etc. that causes something bad to start: There are fears that the incident may be a trigger for further violence in the capital.Beginnings and starts

trigger

verb [T] uk   /ˈtrɪɡ.ər/ us    //
C1 to cause something bad to start: Some people find that certain foods trigger their headaches. The racial killings at the weekend have triggered off a wave of protests.Starting and beginningStarting again
(Definition of trigger from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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