irruption
ir·rup·tion
noun
3.
a sudden violent spontaneous occurrence (usually of some undesirable condition)
- “the outbreak of hostilities”
Origin
From Middle French irruption, from Latin irruptiō(n).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.