erupt

verb

1. start abruptly"After 1989, peace broke out in the former East Bloc"
2. erupt or intensify suddenly"Unrest erupted in the country"
3. start to burn or burst into flames"Marsh gases ignited suddenly"
4. break out"The tooth erupted and had to be extracted"
5. become active and spew forth lava and rocks"Vesuvius erupts once in a while"
6. force out or release suddenly and often violently something pent up"break into tears"
7. appear on the skin"A rash erupted on her arms after she had touched the exotic plant"
8. become raw or open"He broke out in hives"