Other forms: triggered, triggering, triggers
To trigger something is to be the small thing that starts a much bigger one. One dropped match triggers a wildfire, a peanut triggers an allergic reaction, a missed payment triggers a letter from the bank.
The noun came first: the trigger is the little curved lever your finger pulls to fire a gun, and every other use is that picture stretched. So a trigger is any cause that sets something off, such as a trigger for migraines or the trigger for the whole argument. In talk about mental health, a trigger is a sight, a sound or a word that brings back distress, and people say they were triggered by it. Someone trigger-happy shoots, or acts, far too readily, and to pull the trigger on a plan is to stop hesitating and do it. Mind the double g in the spelling.
1verbsparkTo make something start to happen.~20%
“The storm triggered floods across the whole valley.”
2verbtriggerTo set off a strong emotional reaction, especially a memory of something distressing.~2%
“Fireworks trigger his memories of the war.”
3nounsmallThe small lever you pull with your finger to fire a gun.~29%
“He kept his finger well away from the trigger.”
4nounanythingAnything that causes something else to start, including a memory or a strong feeling.~49%
“Cheese is a common trigger for her headaches.”
Shares are an estimate: a language model read 11 sentences found in the wild and placed 10 of them on a sense (1 were unclear) — a count of our sample, not a measurement of English.
trigger is a cause.
Also accepted in games: spark
The trigger was a tricker first. English borrowed Dutch trekker, a puller, from trekken, 'to drag, draw, pull'. It is a plain word for a plain thing, the part of a gun you pull, and everything modern about it, from triggering a reaction to a trigger warning, is that same pull passed on to something larger.
Dutch
trekken — to drag, draw, pull
English, today
trigger
Originally tricker, from Dutch trekker (“pull”), from Dutch trekken (“to drag, draw, pull”).
Etymology from Wiktionary, CC BY-SA