trigger

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♦ trig|ger /tr'ɪgər/ (triggers triggering triggered)
1 [N-COUNT]
The trigger of a gun is a small lever which you pull to fire it.
A man pointed a gun at them and pulled the trigger.
2 [N-COUNT] oft N n
The trigger of a bomb is the device which causes it to explode.
...trigger devices for nuclear weapons.
3 [VERB] V n
To trigger a bomb or system means to cause it to work.
The thieves must have deliberately triggered the alarm and hidden inside the house...
= activate
4 [VERB] V n
If something triggers an event or situation, it causes it to begin to happen or exist.
...the incident which triggered the outbreak of the First World War...
[PHRASAL VERB] V P n (not pron), also V n P
Trigger off means the same as trigger.
It is still not clear what events triggered off the demonstrations.
5 [N-COUNT] oft N for n
If something acts as a trigger for another thing such as an illness, event, or situation, the first thing causes the second thing to begin to happen or exist.
Stress may act as a trigger for these illnesses.

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