outburst in WordNet English dictionary

1. an unrestrained expression of emotion
   effusion  gush  outburst  blowup  ebullition 
   
2. a sudden intense happening
   "an outburst of heavy rain"; "a burst of lightning"
   outburst  burst  flare-up 
   
3. a sudden violent disturbance
   outburst  tumultuous disturbance