burst-out

(v) give sudden release to an expression
- We burst out laughing
- "I hate you," she burst out
(v) appear suddenly
- Spring popped up everywhere in the valley
pop out,
(v) erupt or intensify suddenly
- Unrest erupted in the country
- Tempers flared at the meeting
- The crowd irrupted into a burst of patriotism
erupt, flare up, irrupt, break open, flare,

pop out erupt flare up irrupt break open flare