. "Trop. , to break or rush in or upon; to intrude upon , invade , attack , interrupt : grammatici ad prosopopoeias usque ... irrumpunt, venture upon , i. e. presume to teach" . "Trop. , to break or rush in or upon; to intrude upon , invade , attack , interrupt : grammatici ad prosopopoeias usque ... irrumpunt, venture upon , i. e. presume to teach" . .