Toggle and Trigger

noun

• Any instruction that works first one way and then the other; it turns something on the first time it is used and then turns it off the next time.
• A hinged switch that can assume either of two positions.
  • synonyms: toggle switch, on-off switch, on/off switch
• A fastener consisting of a peg or pin or crosspiece that is inserted into an eye at the end of a rope or a chain or a cable in order to fasten it to something (as another rope or chain or cable. )

verb

• Provide with a toggle or toggles.
• Fasten with, or as if with, a toggle.
• Release by a toggle switch.
  • usage: "toggle a bomb from an airplane"

• (n.) Two rods or plates connected by a toggle joint.
• (n.) A wooden pin tapering toward both ends with a groove around its middle, fixed transversely in the eye of a rope to be secured to any other loop or bight or ring; a kind of button or frog capable of being readily engaged and disengaged for temporary purposes.

noun

• Lever that activates the firing mechanism of a gun.
  • synonyms: gun trigger
• A device that activates or releases or causes something to happen.
• An act that sets in motion some course of events.
  • synonyms: induction, initiation

verb

• Put in motion or move to act.
  • usage: "trigger a reaction"; "actuate the circuits"
  • synonyms: trip, actuate, activate, set off, spark off, spark, trigger off, touch off
• Release or pull the trigger on.
  • usage: "Trigger a gun"

adjective

• Neat and smart in appearance.
  • usage: "a clean-cut and well-bred young man"; "the trig corporal in his jaunty cap"; "a trim beard"
  • synonyms: clean-cut, trig, trim

• (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.

Trigger is a point, threshold, or event which precipitates an action, exercise, or change in behavior. The occurrence is often viewed as the catalyst of an important condition.