trigger Definition in Cambridge British English Dictionary
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Definition of "trigger" - British English Dictionary

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triggernoun

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.

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.

triggerverb [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.
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(Definition of trigger from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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