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 ;

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" ;