1. phrasal verb
The class burst out laughing.
Then the applause burst out.
Everyone burst out into conversation.
2. phrasal verb
If someone bursts out something, they say it suddenly and loudly.
'I want to be just like you', she bursts out.
3. phrasal verb burst
Malaria is bursting out again all over the world.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers