Synonyms for Burst Forth (same or very similar meaning)
WordNet sense 1 (jump out from a hiding place and surprise (someone)):
leap out, rush out, sally outWordNet sense 2 (be unleashed; emerge with violence or noise):
explode, break looseWordNet sense 3 (come into or as if into flower):
effloresceFrom the ODE community, based on WordNetadd/edit