spoil sport

spoilsport

[spoil-spawrt, -spohrt]
noun
a person whose selfish or unsportsmanlike attitudes or actions spoil the pleasure of others, as in a game or social gathering.

Origin:
1815–25; from phrase spoil the sport

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World English Dictionary
spoilsport (ˈspɔɪlˌspɔːt)
 
n
informal a person who spoils the pleasure of other people by his actions or attitudes

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