Learner's definition of ERUPT
to send out rocks, ash, lava, etc., in a sudden explosion
to come out in a sudden explosion
— + from
to happen or begin suddenly and violently
War could erupt [=break out] in that part of the world at any time.
Riots erupted last summer.
A bitter dispute has erupted among the members of the team.
to begin doing something (such as shouting or applauding) suddenly
— usually + in, into, or with
to appear suddenly on the skin
of a tooth
to come out through the gum