also: トリガ
Refers to the physical trigger of a firearm, or metaphorically to something that initiates an event or reaction.
彼は銃のトリガーを引いた。
He pulled the trigger of the gun.
その事件が戦争のトリガーとなった。
That incident became the trigger for the war.
That incident triggered the war.
He pulled the trigger of the gun.