Webster's English Dictionary

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erupt

erupt \i-'r*pt\ \-'r*p-t*-b*l\ vb [L eruptus, pp. of erumpere to burst 
   forth, fr. e- + rumpe]re to break 1a: to force out or release suddenly and 
   often violently something pent up  1b: to burst from limits or restraint  
   1c: to become active or violent : EXPLODE  2: to break out with a skin 
   eruption  : to force out or release usu. suddenly and violently  - 
   erupt.ible aj