Etymology
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irrupt (v.)

"to break into," 1805 (implied in irrupted), back-formation from irruption or else from Latin irruptus, past participle of irrumpere "to break in, burst into."

updated on January 12, 2016

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Definitions of irrupt from WordNet

irrupt (v.)
enter uninvited;
She irrupted into our sitting room
Synonyms: intrude
irrupt (v.)
erupt or intensify suddenly;
The crowd irrupted into a burst of patriotism
Synonyms: erupt / flare up / flare / break open / burst out
irrupt (v.)
increase rapidly and in an uncontrolled manner;
The island's rodent population irrupted
Synonyms: explode
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.