Verbs

(v)burst outgive sudden release to an expression“We burst out laughing”, “‘I hate you,’ she burst out”
(v)erupt, irrupt, flare up, flare, break open, burst outerupt or intensify suddenly“Unrest erupted in the country”, “Tempers flared at the meeting”, “The crowd irrupted into a burst of patriotism”
(v)crop up, pop up, pop, pop out, burst outappear suddenly or unexpectedly; happen unexpectedly“The farm popped into view as we turned the corner”, “He suddenly popped up out of nowhere”