He was a damp blanket at the party, complaining about everything.
Он был человеком, портящим удовольствие на вечеринке, постоянно жалуясь на всё.
Definitions
A 'damp blanket' is a person who discourages others or dampens the enthusiasm and excitement in a group, often by being negative, pessimistic, or unenthusiastic.
