Merriam-Webster Collegiate Dictionary - erupt

 verb  Etymology: Latin ~us, past participle of erumpere to burst forth, from e- + rumpere to break — more at reave  Date: 1657  intransitive verb  1.  a.  (1) to burst from limits or restraint  (2) of a tooth to emerge through the gum  b. to force out or release suddenly and often violently something (as lava or steam) that is pent up  c. to become active or violent especially suddenly ; break forth war could ~ at any moment the audience ~ed in applause  2. to break out with or as if with a skin ~ion  transitive verb to force out or release usually suddenly and violently a volcano ~ing lava and ash  • ~ible adjective  • ~ive adjective  • ~ively adverb