Definition of burst out phrasal verb from the Oxford Advanced American Dictionary

 

burst out

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to speak suddenly, loudly, and with strong feeling “For heavens' sake!” he burst out. related noun outburst
  2. 2to begin doing something suddenly Karen burst out laughing.
See the Oxford Advanced Learner's Dictionary entry: burst out