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