Main Entry: ir·rupt

Pronunciation: \i-ˈrəpt\

Function: intransitive verb

Etymology: Latin irruptus, past participle of irrumpere, from in- + rumpere to break — more at reave

Date: 1886

1 : to rush in forcibly or violently
2 of a natural population : to undergo a sudden upsurge in numbers especially when natural ecological balances and checks are disturbed
3 : erupt 1c <the crowd irrupted in a fervor of patriotism — Time>

— ir·rup·tion \-ˈrəp-shən\ noun