wet blanket

wet blanket idiom
A person who discourages enjoyment or enthusiasm, as in Don't be such a wet blanket—the carnival will be fun! This expression alludes to smothering a fire with a wet blanket. [Early 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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