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trigger

  

      vb   activate, bring about, cause, elicit, generate, give rise to, produce, prompt, provoke, set in motion, set off, spark off, start  
  
Antonyms     
   bar, block, hinder, impede, inhibit, obstruct, prevent, repress, stop  
English Collins Dictionary - English synonyms & Thesaurus  
Collins

trigger

  
  ( triggers    plural & 3rd person present)   ( triggering    present participle)   ( triggered    past tense & past participle  )
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   The trigger of a bomb is the device which causes it to explode.  
oft N n  
...trigger devices for nuclear weapons.     
3       verb   To trigger a bomb or system means to cause it to work.   (=activate)  
The thieves must have deliberately triggered the alarm and hidden inside the house...      V n  
4       verb   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...      V n  
      Trigger off means the same as trigger., phrasal verb  
It is still not clear what events triggered off the demonstrations.      V P n (not pron), Also V n P  
5       n-count   If something acts as a triggerfor another thing such as an illness, event, or situation, the first thing causes the second thing to begin to happen or exist.  
oft N for n  
Stress may act as a trigger for these illnesses.     


hair-trigger     
If you describe something as hair-trigger, you mean that it is likely to change very violently and suddenly.      adj   ADJ n  
His boozing, arrogance, and hair-trigger temper have often led him into ugly nightclub brawls..., A hair-trigger situation has been created which could lead to an outbreak of war at any time.     
trigger-happy      , trigger happy  
If you describe someone as trigger-happy, you disapprove of them because they are too ready and willing to use violence and weapons, especially guns.  
INFORMAL      adj  
  (disapproval)   
Some of them are a bit trigger-happy<endash>they'll shoot at anything that moves.     

Translation English Cobuild Collins Dictionary  

See also:

trifler, tripper, tribe, trice

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