Start abruptly.

synonym: break out.

Erupt or intensify suddenly:
— Unrest erupted in the country.

synonyms: break open, burst out, flare, flare up, irrupt.

Dutch: losbarsten, losbreken, uitbreken

Start to burn or burst into flames.

synonyms: catch fire, combust, conflagrate, ignite, take fire.

Dutch: ontbranden, ontvlammen, vlamvatten

Break out:
— The tooth erupted and had to be extracted.

synonyms: break through, come out, push through.

Become active and spew forth lava and rocks:
— Vesuvius erupts once in a while.

synonyms: belch, extravasate.

Roget 297: give exit, give vent to; let out, give out, pour out, squeeze out, send out; dispatch, despatch; exhale, excern^†, excrete; embogue^†; secrete, secern^†; extravasate [Med.], shed, void, evacuation; emit; open the sluices, open the floodgates; turn on the tap; extrude, detrude^†; effuse, spend, expend; pour forth; squirt, spirt^†, spurt, spill, slop; perspire etc. (exude) 295; breathe, blow etc. (wind) 349.    tap, draw off; bale out, lade out; let blood, broach.    eject, reject; expel, discard; cut, send to coventry, boycott; chasser [Fr.]; banish etc. (punish) 972; bounce [U.S.]; fire [Slang], fire out [Slang]; throw etc. 284, throw out, throw up, throw off, throw away, throw aside; push etc. 276; throw out, throw off, throw away, throw aside; shovel out, shovel away, sweep out, sweep away; brush off, brush away, whisk off, whisk away, turn off, turn away, send off, send away; discharge; send adrift, turn adrift, cast adrift; turn out, bundle out; throw overboard; give the sack to; send packing, send about one's business, send to the right about; strike off the roll etc. (abrogate) 756; turn out neck and heels, turn out head and shoulders, turn out neck and crop; pack off; send away with a flea in the ear; send to Jericho; bow out, show the door to, turn out of doors, turn out of house and home; evict, oust; unhouse, unkennel; dislodge; unpeople^†, dispeople^†; depopulate; relegate, deport.    empty; drain to the dregs; sweep off; clear off, clear out, clear away; suck, draw off; clean out, make a clean sweep of, clear decks, purge.    embowel^†, disbowel^†, disembowel; eviscerate, gut; unearth, root out, root up; averuncate^†; weed out, get out; eliminate, get rid of, do away with, shake off; exenterate^†.    vomit, throw up, regurgitate, spew, puke, keck^†, retch, heave, upchuck, chuck up, barf; belch out; cast up, bring up, be sick, get sick, worship the porcelain god.    disgorge; expectorate, clear the throat, hawk, spit, sputter, splutter, slobber, drivel, slaver, slabber^†; eructate; drool.    unpack, unlade, unload, unship, offload; break bulk; dump.    be let out.    spew forth, erupt, ooze etc. (emerge) 295.    ... show more

Force out or release suddenly and often violently something pent up:
— Erupt in anger.

synonyms: break, burst.

Appear on the skin.

Become raw or open.

synonyms: break out, recrudesce.