Noun
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an act that sets in motion some course of events
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a device that activates or releases or causes something to happen
-
lever that activates the firing mechanism of a gun
- gun trigger
Verb
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release or pull the trigger on
"Trigger a gun"
-
put in motion or move to act
"trigger a reaction"
"actuate the circuits"
- set off - spark off - trigger off - touch off