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Definition of: trigger
Our photo definition of trigger 
(trig′ər) noun
1. The fingerpiece of a gunlock or pistol–lock, for releasing the hammer.
2. A catch or small lever doing similar service in a trap or other mechanism.
—quick on the trigger
1. Quick to shoot.
2. Quick to act in response to a suggestion; quick–witted; alert.
—v.t. To cause or precipitate. [Earlier tricker <Du. trekker <trekken pull, tug at]
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