Question

what is the trigger mechanism​

Answer 1

A trigger is a mechanism that actuates the firing sequence of a firearm, airgun, crossbow or speargun. A trigger may also start other non-shooting mechanisms such as a trap, a switch or a quick release. A small amount of energy applied to the trigger causes the release of much more energy.

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Answer 2

Answer:

Medical Definition of trigger mechanism

something (as a specific act or stimulus) that in interaction with the body constitutes a physiological trigger especially : one by which an attack (as of disease or referred pain) is precipitated.