Definition of killjoy noun from the Oxford Advanced Learner's Dictionary

 

killjoy

 noun
noun
BrE BrE//ˈkɪldʒɔɪ//
 
; NAmE NAmE//ˈkɪldʒɔɪ//
 
(disapproving)
 
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a person who likes to spoil other people’s enjoyment
See the Oxford Advanced American Dictionary entry: killjoy