Informal One that discourages enjoyment or enthusiasm.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "wet blanket" in a sentence
"Rabies asked doubtfully, playing the wet blanket even though his pulse was already beating faster at the tone of Greenberg’s voice."