Source : WordNet®

burst out
     v 1: give sudden release to an expression; "We burst out
          laughing"; "'I hate you,' she burst out"
     2: appear suddenly; "Spring popped up everywhere in the valley"
        [syn: {pop out}]
     3: erupt or intensify suddenly; "Unrest erupted in the
        country"; "Tempers flared at the meeting"; "The crowd
        irrupted into a burst of patriotism" [syn: {erupt}, {irrupt},
         {flare up}, {flare}, {break open}]