Police officers are trained to not be too 'quick on the trigger'. [=eager to fire a gun]
The timer was set to 'trigger' the bomb in exactly one hour.
The faulty wire was the 'trigger for' the explosion.
(..) His blood runs in my veins. He's the spitting image of old Bootstrap Bill come back to haunt us. On my word, do as I say, or I'll pull this trigger and be lost to Davy Jones' locker. Name your terms, Mr.Turner. Elizabeth goes free. Yes, we know that one. (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl