The Collaborative International Dictionary of English v.0.48:

erupt \e*rupt"\ ([-e]*r[u^]pt"), v. t. [See eruption.]
   To cause to burst forth; to eject; as, to erupt lava.
   --Huxley.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

erupt \e*rupt"\ ([-e]*r[u^]pt"), v. i. [See eruption.]
   1. To eject something, esp. lava, water, etc., as a volcano
      or geyser; as, when Mount Saint Helens erupted, some
      people were taken by surprise.
      [Webster 1913 Suppl. +PJC]

   2. To burst forth; to break out, as ashes from a volcano,
      teeth through the gums, etc.; as, the third molar erupts
      late in most people, and in some persons does not occur at
      all.
      [Webster 1913 Suppl. +PJC]

            When the amount and power of the steam is equal to
            the demand, it erupts with violence through the lava
            flood and gives us a small volcano.   --H. J. W.
                                                  Dam.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

erupt
    v 1: start abruptly; "After 1989, peace broke out in the former
         East Bloc" [syn: erupt, break out]
    2: erupt or intensify suddenly; "Unrest erupted in the country";
       "Tempers flared at the meeting"; "The crowd irrupted into a
       burst of patriotism" [syn: erupt, irrupt, flare up,
       flare, break open, burst out]
    3: start to burn or burst into flames; "Marsh gases ignited
       suddenly"; "The oily rags combusted spontaneously" [syn:
       erupt, ignite, catch fire, take fire, combust,
       conflagrate]
    4: break out; "The tooth erupted and had to be extracted" [syn:
       erupt, come out, break through, push through]
    5: become active and spew forth lava and rocks; "Vesuvius erupts
       once in a while" [syn: erupt, belch, extravasate]
    6: force out or release suddenly and often violently something
       pent up; "break into tears"; "erupt in anger" [syn: break,
       burst, erupt]
    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"; "My skin breaks
       out when I eat strawberries"; "Such boils tend to recrudesce"
       [syn: erupt, recrudesce, break out]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "erupt":
   OD, appear, arise, bail out, be born, be brought down, be felled,
   be struck down, be traumatized, become, belch, blow open, blow out,
   blow up, bob up, boil, break cover, break forth, break out,
   break through, burst forth, burst out, cast forth, cast up, catch,
   catch cold, collapse, come, come down with, come forth, come out,
   come to be, contract, crop up, debouch, decant, detonate,
   discharge, disembogue, disgorge, effuse, ejaculate, eject, emanate,
   emerge, emit, eruct, exhaust, exit, expel, explode, extravasate,
   extrude, fever, find vent, flare up, flash, get, get to be, gleam,
   go into shock, go off, have origin, hurl, hurl forth, irrupt,
   issue, issue forth, jet, jump out, leak out, ooze out, originate,
   outpour, overdose, pop up, pour, pour forth, pour out, protrude,
   rise, run a temperature, run out, sally, sally forth, send forth,
   send out, sicken, spew, spew out, spout, spring up, spurt, squirt,
   start up, surface, take, take birth, take ill, take rise,
   throw off, throw out, throw up, touch off, vomit, vomit forth