Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One who spoils the enthusiasm or fun of others.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person who is anti-fun, or prevents others from having fun

Etymologies

kill +‎ joy, first attested in 1776. (Wiktionary)

Examples

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