irruption

Noun
  1. A sudden violent entrance;
    A bursting in (synset 100050395)
    "the recent irruption of bad manners"
  2. A sudden sharp increase in the relative numbers of a population (synset 113560346)
  3. A sudden violent spontaneous occurrence (usually of some undesirable condition) (synset 107449873)
    "the outbreak of hostilities"

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