enter uninvited; "They intruded on our dinner party"; "She irrupted into our sitting room"
erupt or intensify suddenly; "Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"
increase rapidly and in an uncontrolled manner; "The population of India is exploding"; "The island's rodent population irrupted"