1. bursting or breaking in suddenly and forcefully
Usage: present participle of irrupt
2. increasing rapidly in population and spreading into new areas
Usage: ecology; used of animal populations

Examples

• The protesters were irrupting into the building through the main entrance.
• Water came irrupting through the broken dam.
• The owl population has been irrupting southward this winter.
• Crowds were irrupting onto the field after the victory.
• The squirrel population is irrupting due to the abundant acorn crop.
• Steam was irrupting from the geyser every few minutes.