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general::
Phrase(s): burst out into something [and] burst into something
1. Fig. [for plants or trees] to open their flowers seemingly suddenly and simultaneously. (Burst indicates suddenness.) • The flowers burst out into blossom very early. • They burst into blossom during the first warm day. 2. Fig. [for someone] to begin suddenly doing a particular activity, such as crying, laughing, chattering; to begin an activity such as laughter, chatter, tears, etc. • Suddenly, she burst out into laughter. • The child burst into tears.
McGrawhill's American Idioms And Phrasal Verbs