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(military) A quick hostile or predatory incursion or invasion in a battle.
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(law enforcement) An attack or invasion for the purpose of making arrests, seizing property, or plundering.
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(sports) An attacking movement.
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(Internet slang) An activity initiated at or towards the end of a live broadcast by the broadcaster that sends its viewers to a different broadcast, primarily intended to boost the viewership of the receiving broadcaster. This is frequently accompanied by a message in the form of a hashtag that is posted in the broadcast's chat by the viewers.
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(online gaming) A large group in a massively multiplayer online game, consisting of multiple parties who team up to defeat a powerful enemy.
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(social media) An event involving one or more users, often using bots and scripts, who join a server to harm it or harass its members.