noun
spoilsport
SPOYL-spawt
noun
1
Someone who ruins other people's enjoyment or fun.
"Don't be a spoilsport — come dancing with us!"
How to Use Spoilsport
Learner’s notesIn plain EnglishSomeone who kills the fun for everyone else.
When to use it
Informal, mildly disapproving.
Word Forms
more spoilsport comparative, spoilsports plural, most spoilsport superlative
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Don't be a _____ — come dancing with us!
Etymology
From the phrase "spoil sport," meaning to ruin the amusement.