trigger

US /ˈtrɪɡ.ɚ/
UK /ˈtrɪɡ.ɚ/
"trigger" picture
1.

a small device that releases a spring or catch and so sets off a mechanism, especially in a gun

:
•
He pulled the trigger and the gun fired.
•
Be careful not to accidentally touch the trigger.
:
levercatchreleaseswitch
2.

an event or circumstance that is the cause of a particular action, process, or situation

:
•
The loud noise was the trigger for his anxiety attack.
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Stress can be a major trigger for migraines.
:
catalyststimulusimpetuspromptinducement
1.

cause (an event or situation) to happen or exist

:
•
The alarm was triggered by smoke.
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His comments triggered a heated debate.
:
activateinitiatesparkpromptgenerate