trigger2 also trigger off [transitive]
to make something happen very quickly, especially a series of events:
The assassination triggered off a wave of rioting.
Certain forms of mental illness can be triggered by food allergies.
trigger a memory (=make you suddenly remember something)
His action triggered a massive response from the government.
to make something such as a bomb or electrical system start to operate:
The burglars fled after triggering the alarm.