Definitions of erupt:

• verb:   start to burn or burst into flames
• verb:   become active and spew forth lava and rocks

  Example: "Vesuvius erupts once in a while"

• verb:   erupt or intensify suddenly

  Example: "Unrest erupted in the country"

• verb:   become raw or open
• verb:   start abruptly
• verb:   appear on the skin

  Example: "A rash erupted on her arms after she had touched the exotic plant"

• verb:   as of teeth, for example

  Example: "The tooth erupted and had to be extracted"

• verb:   force out or release suddenly and often violently something pent up

  Example: "Erupt in anger"