Trigger

v. start, precipitate, initiate; activate; fire a weapon

n. lever which is pulled on to fire a gun; agent, stimulus; signal in computers which causes the launching of a certain procedure (Computers)

Trigger may refer to:Trigger (firearms), a mechanism that actuates the firing of firearmsTrigger pad, a device used in electronic percussionSchmitt trigger, an electronic circuitUSS Trigger (SS-237), a submarineUSS Trigger (SS-564), a submarineBruce Trigger, archeologistTrigger (horse), owned by cowboy star Roy RogersTrigger (Only Fools and Horses), a fictional character from the BBC sit-com Only Fools and HorsesTrigger, a fictional horse in Ernie (the Fastest Milkman in the West)A Casus Belli, an event triggering a war
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Trigger Pulmonology A factor that may exacerbate asthma; a stimulus that causes an ↑ in asthma Sx and/or airflow limitation [more]Trigger - Community and Resources

Noun
1. lever that activates the firing mechanism of a gun
(synonym) gun trigger
(hypernym) lever
(hyponym) hair trigger
(part-holonym) gun
2. a device that activates or releases or causes something to happen
(hypernym) device
(hyponym) plutonium trigger, plutonium pit
3. an act that sets in motion some course of events
(synonym) induction, initiation
(hypernym) causing, causation
(hyponym) fomentation, instigation
(derivation) trip, actuate, activate, set off, spark off, spark, trigger off, touch off
Verb
1. put in motion or move to act; "trigger a reaction"; "actuate the circuits"
(synonym) trip, actuate, activate, set off, spark off, spark, trigger off, touch off
(hypernym) initiate, pioneer
(cause) happen, hap, go on, pass off, occur, pass, fall out, come about, take place
(derivation) induction, initiation
2. release or pull the trigger on; "Trigger a gun"
(entail) fire, discharge
(derivation) gun trigger

(n.)
A piece, as a lever, which is connected with a catch or detent as a means of releasing it; especially (Firearms), the part of a lock which is moved by the finger to release the cock and discharge the piece.
  

(n.)
A catch to hold the wheel of a carriage on a declivity.