verb

estallar

burst

Significa romperse o abrirse de repente con fuerza, produciendo un ruido fuerte o una explosión.

To explode or burst: to break open suddenly, often with a loud noise. It can also describe something bursting, such as a balloon.
To break out or erupt: to begin suddenly, as with a war, a fire, or an argument.
To burst into an emotion or action: to suddenly start laughing, crying, or expressing anger.

Estallar is a regular -ar verb. It is usually intransitive: the thing that explodes or breaks out is the subject.

It comes from Vulgar Latin *staculāre, related to breaking or splintering.

explotar — “to explode”; often interchangeable with estallar for explosions, though it also means “to exploit.”
reventar — “to burst” or “break apart,” often emphasizing pressure or rupture.
brotar — “to spring up” or “emerge”; it can describe something appearing suddenly, but does not imply an explosion.
apagarse — “to go out” or “be extinguished”; an opposite when estallar refers to a fire breaking out.