1. phrasal verb
If someone bursts out laughing, crying, or making another noise, they suddenly start making that noise. You can also say that a noise bursts out.
[V P v-ing] ⇒ The class burst out laughing.
[V P] ⇒ Then the applause burst out.
[V P + into/in] ⇒ Everyone burst out into conversation.
2. phrasal verb
If someone bursts out something, they say it suddenly and loudly. [written]
[V P with quote] ⇒ 'I want to be just like you', she bursts out.
3. phrasal verb → burst If a situation or problem bursts out, it suddenly appears.
[V P prep/adv] ⇒ Malaria is bursting out again all over the world.
[V P] ⇒ Then war burst out.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers