wet blanket
US /wɛt ˈblæŋkɪt/
UK /wɛt ˈblæŋkɪt/

1.
perosak suasana, pembantut keseronokan
a person who spoils other people's fun by being negative and unenthusiastic
:
•
Don't invite John to the party; he's such a wet blanket.
Jangan jemput John ke parti; dia memang perosak suasana.
•
She's always being a wet blanket, complaining about everything.
Dia selalu menjadi perosak suasana, mengeluh tentang segala-galanya.