say it: TRIG-ur
trigger is a noun and verb meaning "lever that activates the firing mechanism of a gun". It carries 5 recorded senses.
lever that activates the firing mechanism of a gun
a device that activates or releases or causes something to happen
an act that sets in motion some course of events
release or pull the trigger on
“Trigger a gun”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for trigger come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.