1. a blanket dampened with water so as to extinguish a fire.
2. a person or thing that dampens enthusiasm or enjoyment: Nobody asked him to join the group because he's such a wet blanket.
Pronunciation: (wet'blang'kit), [key]
1. to extinguish (a fire) with a wet blanket.
2. to dampen the enthusiasm or enjoyment of (a person, group, etc.).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.