trigger
/ˈtɹɪɡə/
A finger-operated lever used to fire a gun.
Just pull the trigger.
A similar device used to activate any mechanism.
An event that initiates others, or incites a response.
Sleeping in an unfamiliar room can be a trigger for sleepwalking.
A concept or image that upsets somebody.
I can't watch that violent film. Blood is one of my triggers.
An event, experience or other stimulus that initiates a traumatic memory or action in a person.
An electronic transducer allowing a drum, cymbal, etc. to control an electronic drum unit or similar device.
A device that manually lengthens (or sometimes shortens) the slide or tubing of a brass instrument, allowing the pitch range to be altered while playing.
A pulse in an electronic circuit that initiates some component.
An SQL procedure that may be initiated when a record is inserted, updated or deleted; typically used to maintain referential integrity.
A text string that, when received by a player, will cause the player to execute a certain command.
A catch to hold the wheel of a carriage on a declivity.