Idiom Definition:
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"to jump the gun"  
    to act hastily;    
    to do something before it should be done
    
     Synonyms
    
   
  Synonyms: abrupt, 
    breakneck, 
    brief, 
    frantic, 
    gone off half-cocked, 
    harum-scarum, 
    hasty, 
    headlong, 
    heedless, 
    hurried, 
    ill-advised, 
    impatient, 
    impetuous, 
    indiscreet, 
    jump the gun, 
    madcap, 
    off the hip, 
    off the top of head, 
    plunging, 
    precipitant, 
    quick, 
    rapid, 
    rash, 
    reckless, 
    refractory, 
    rushing, 
    subitaneous, 
    swift, 
    unanticipated, 
    uncontrolled, 
    unexpected, 
    unforeseen, 
    violent, 
    wilful, 
    without warning