trigger mechanism
mechanism holding the impact mechanism of a projectile weapon in tension until the former's actuation
en-US/ˈtɹɪɡɚ ˈmɛkəˌnɪzəm/
en-GB/ˈtɹɪɡə ˈmɛkənɪzəm/
mechanism holding the impact mechanism of a projectile weapon in tension until the former's actuation