A catch to hold the wheel of a carriage on a declivity.
- The lever pressed by the finger to discharge a firearm.
- A similar device used to release or activate a mechanism.
- An event that precipitates other events.
- Electronics A pulse or circuit that initiates the action of another component.
- To set off; initiate: remarks that triggered bitter debates.
- To fire or explode (a weapon or an explosive charge).