1    a small projecting lever that activates the firing mechanism of a firearm  
2      (Machinery)   a device that releases a spring-loaded mechanism or a similar arrangement  
3    any event that sets a course of action in motion  
      vb   tr  
4    usually foll by: off   to give rise (to); set off  
5    to fire or set in motion by or as by pulling a trigger  
     (C17 tricker, from Dutch trekker, from trekken to pull; see trek)  
  triggered      adj  
  triggerless      adj  

hair trigger  
1    a trigger of a firearm that responds to very slight pressure  
2    Informal  
a    any mechanism, reaction, etc., set in operation by slight provocation  
b    (as modifier)  
a hair-trigger temper     
Schmitt trigger  
      n     (Electronics)   a bistable circuit that gives a constant output when the input voltage is above a specified value  
     (C20: named after O. H. Schmitt (born 1913), US scientist)  
1    tending to resort to the use of firearms or violence irresponsibly  
2    tending to act rashly or without due consideration  
trigger plant  
      n     (Austral)   any of several small grasslike plants of the genus Stylidium, having sensitive stamens that are erected when disturbed: family Stylidiaceae  
Dictionnaire anglais Collins English definition-Thesaurus  



      vb   activate, bring about, cause, elicit, generate, give rise to, produce, prompt, provoke, set in motion, set off, spark off, start  
   bar, block, hinder, impede, inhibit, obstruct, prevent, repress, stop  

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"