/ ɪˈrʌpt; NAmE / verb
[ v + adv. / prep. ] ( formal ) to enter or appear somewhere suddenly and with a lot of force :
Violence once again irrupted into their peaceful lives.
► ir·rup·tion / ɪˈrʌpʃn; NAmE / noun [ U , C ]
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WORD ORIGIN
mid 19th cent.: (earlier (mid 16th cent.) as irruption ) from Latin irrupt- broken into, from the verb irrumpere , from in- into + rumpere break.