irruption

Plural: irruptions

Noun

• a sudden violent entrance; a bursting in
  • "the recent irruption of bad manners"
• a sudden sharp increase in the relative numbers of a population
• a sudden violent spontaneous occurrence (usually of some undesirable condition)
• The action of irrupting or breaking into; a violent entry or invasion; an inbreaking; an intrusion.
• An abrupt increase of an animal population.
• An abrupt increase in the size of a movement or organization.

Examples

• Extreme rainfall events predict irruptions of rat plagues in central Australia.
• How can we explain this irruption of young people self-identifying as socialists?
• The Trojan irruption into the Greek camp is related in Book XV of the Iliad.

Synonyms

eruption, outbreak