gatecrasher

/ˈɡeɪtˌkræʃər/
noun
  1. A person who attends a private party, event, or gathering without an invitation or without paying.
    • Security guards spotted a gatecrasher trying to slip into the concert hall.
    • The host was annoyed when a gatecrasher showed up and started eating the food.
    • At the wedding, a gatecrasher pretended to be a distant cousin to get inside.
Antonyms
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