Literal trigger of a firearm or similar mechanism.
彼は引き金を引いたが、弾は出なかった。
He pulled the trigger, but the bullet didn't come out.
trigger (for something); immediate cause
Figurative use: an event or factor that directly causes something to happen.
その発言が喧嘩の引き金になった。
That remark triggered the fight.
小さなミスが大きな事故の引き金になることもある。
A small mistake can sometimes trigger a major accident.
A single small incident became the trigger for the war.
He stayed still with his finger on the trigger.
Search-only kana form; not a standard written spelling.
Rare kanji form using 鉄; it is rarely used.