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English definition of “spoilsport”

spoilsport

noun [C]     /ˈspɔɪl.spɔːt/ US  /-spɔːrt/ informal disapproving
a person who stops other people from enjoying themselves: She did ask her dad if she could have a big party, but the old spoilsport refused.People who are boring and old-fashioned
(Definition of spoilsport noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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