1. (v.i.)erupt to burst forth: Molten lava erupted from the volcano.
2. erupt (of a volcano, geyser, etc.) to eject matter.
3. erupt to break out of a pent-up state, usu. in a sudden and violent manner.
4. erupt to break out, as in a skin rash.
5. erupt (of teeth) to grow through surrounding hard and soft tissues and become visible in the mouth.
6. (v.t.)erupt to release violently; burst forth with.
7. erupt (of a volcano, geyser, etc.) to eject (matter).
Etymology: (1650–60; < L ēruptus, ptp. of ērumpere to burst out)
Definition of 'erupt'
Princeton's WordNet
1. (verb)erupt, break out start abruptly "After 1989, peace broke out in the former East Bloc"
2. (verb)erupt, irrupt, flare up, flare, break open, burst out erupt or intensify suddenly "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"
3. (verb)erupt, ignite, catch fire, take fire, combust, conflagrate start to burn or burst into flames "Marsh gases ignited suddenly"; "The oily rags combusted spontaneously"
4. (verb)erupt, come out, break through, push through break out "The tooth erupted and had to be extracted"
5. (verb)erupt, belch, extravasate become active and spew forthlava and rocks "Vesuvius erupts once in a while"
6. (verb)break, burst, erupt force out or release suddenly and often violently something pent up "break into tears"; "erupt in anger"
7. (verb)erupt appear on the skin "A rash erupted on her arms after she had touched the exotic plant"
8. (verb)erupt, recrudesce, break out become raw or open "He broke out in hives"; "My skin breaks out when I eat strawberries"; "Such boils tend to recrudesce"