wet blanket

Etymology
Suggesting that such a person would extinguish fun like how a wet blanket can smother and extinguish a fire.

Noun

 * 1)  A person who takes the fun out of a situation or activity, as by pessimism, demands, dullness, etc.
 * 2)  A timid person; one who lacks confidence; a wimp.
 * 1)  A timid person; one who lacks confidence; a wimp.

Translations

 * Catalan: ,
 * Chinese:
 * Mandarin:
 * Czech:
 * Danish: lyseslukker
 * Dutch:, spelbreekster
 * Finnish:
 * French: ,
 * German:, , ,
 * Italian:
 * Polish:, malkontentka, , smutas, smutaska,
 * Portuguese: desmancha-prazeres,
 * Russian:
 * Spanish:, sosaina
 * Swedish:, dystergök
 * Yiddish: זויערע אוגערקע