"trigger" in the noun sense
1. gun trigger, trigger
lever that activates the firing mechanism of a gun
2. trigger
a device that activates or releases or causes something to happen
3. trigger, induction, initiation
an act that sets in motion some course of events
"trigger" in the verb sense
1. trip, actuate, trigger, activate, set off, spark off, spark, trigger off, touch off
put in motion or move to act
"trigger a reaction"
"actuate the circuits"
2. trigger
release or pull the trigger on
"Trigger a gun"
Source: WordNet® (An amazing lexical database of English)
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