irrupt \ih-RUHPT\ (intransitive verb) - 1 : To burst in forcibly or suddenly; to intrude. 2 : (Ecology) To increase rapidly in number.
"What sounds are these that sting as they caress, that irrupt into my soul and twine about my heart?" -- Nikolai Gogol, Dead Souls
Irrupt is derived from the past participle of Latin irrumpere, from ir-, in-, "in" + rumpere, "to break."