a wet blanket :
blanketborn on the wrong side of the blanket illegitimate
dated
a wet blanketsomeone who has a depressing or discouraging effect on others
A dampened blanket can be used to j smother a fire. The image here is of a person extinguishing a lively or optimistic mood by their gloominess or negativity.
1991 - Michael Curtin - The Plastic Tomato Cutter - When in the company of those of us who do succumb to the occasional dram Father Willie was never a wet blanket.
wet your whistlehave a drink – informal
a wet blanket :
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