A spoilsport is a person who ruins other people's fun. You know: the girl shushing everyone at a sleepover party, the kid who refuses to play when it comes their turn to be "it."

Back before it meant organized athletics, sport meant games or joking. Instead of making fun of someone, you'd be "making sport" of them. So someone who spoils or wrecks the fun or sport of others is a spoilsport. Calling someone a spoilsport, though, is often just a way to pressure them to do something everyone knows is wrong.

Definitions of spoilsport
  1. noun
    someone who spoils the pleasure of others
    synonyms: killjoy, party pooper, wet blanket
    see moresee less
    fuss-budget, fusspot, worrier, worrywart
    thinks about unfortunate things that might happen
    type of:
    persona non grata, unwelcome person
    a person who for some reason is not wanted or welcome
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