Definition

1. Noun:
   • A sudden, violent, or forcible entry: An act of bursting or rushing into a place, often with disruptive force.
   • A sudden, sharp increase in numbers: Specifically, a rapid and significant rise in the population size of a species.
   • A sudden, spontaneous outbreak: The abrupt occurrence of an undesirable condition or event.

Examples of Usage

• Noun:
  • The irruption of the security forces into the building ended the standoff.
  • Ecologists studied the irruption of the vole population in the region.
  • The meeting was disrupted by the irruption of angry protesters.

Advanced Usage

• "Irruption of": Used to specify what is entering or increasing suddenly.
  • The sudden irruption of noise from the street startled everyone.
  • The article discussed the periodic irruption of certain bird species into new territories.

Variants and Related Words

• Irrupt (verb): To enter forcibly or suddenly; to increase rapidly in population.
  • The crowd irrupted into the stadium.
  • Under ideal conditions, the insect population can irrupt.
• Irruptive (adjective): Relating to or characterized by irruption.
  • The study focused on the irruptive growth patterns of the species.

Synonyms

• Incursion: A sudden invasion or attack.
• Influx: A sudden arrival or entry of a large number of people or things.
• Outbreak: A sudden occurrence of something unwelcome, such as disease or conflict.
• Surge: A sudden powerful forward or upward movement.

Related Phrases

• Make an irruption: To force one's way in suddenly. (This is a less common phrasing; "irruption" itself typically implies the action.)
  • The rebels made a violent irruption into the capital.

Related Idioms

• None commonly associated. "Irruption" is a formal term and is not typically used in idiomatic expressions.

Noun

1. a sudden violent spontaneous occurrence (usually of some undesirable condition)
   • the outbreak of hostilities
2. a sudden sharp increase in the relative numbers of a population
3. a sudden violent entrance; a bursting in
   • the recent irruption of bad manners