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irrupt

[ih-ruhpt]
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verb (used without object)
  1. to break or burst in suddenly.
  2. to manifest violent activity or emotion, as a group of persons.
  3. (of animals) to increase suddenly in numbers through a lessening of the number of deaths.

Origin of irrupt

1850–55; < Latin irruptus; see irruption
Related formsun·ir·rupt·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for irrupt

irrupt

verb (intr)
  1. to enter forcibly or suddenly
  2. (of a plant or animal population) to enter a region suddenly and in very large numbers
  3. (of a population) to increase suddenly and greatly
Derived Formsirruption, noun

Word Origin

C19: from Latin irrumpere to rush into, invade, from rumpere to break, burst
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for irrupt

v.

"to break into," 1855, back-formation from irruption or else from Latin irruptus, past participle of irrumpere (see irruption).

Online Etymology Dictionary, © 2010 Douglas Harper