a trigger is a form of:

Trigger



noun
1.
(a lever pulled or pressed to release a catch, a catch that springs a trap) ប្រដាប់ធ្វើឲ្យគ្រឿងចក្រដើរ, កៃកាំភ្លើង trigger of a gun កៃ, trigger of a power tool គន្លឹះ
2.
(បច្ចេកទេស) ហេតុការណ៍ដែលកើតឡើង, គន្លឹះ, កៃ
verb
1.
ធ្វើអោយកើតឡើង, ធ្វើអោយដំណើរការ
2.
(TRANSITIVE) ~ something (off) (to set going, to start. -quick on the trigger alert, impetuous, quick to act) ធ្វើអោយកើតមានឡើង
Example: The battle triggered the revolution.
ENGLISH MEANING
noun
1.
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.
2.
A catch to hold the wheel of a carriage on a declivity.