Here's a breakdown of the possible origins:
* Firefighting: Before modern fire suppression systems, a common method of putting out fires was to throw wet blankets over them. This would smother the flames and prevent them from spreading. The idea was that the wet blanket would cool the fire and absorb oxygen, making it difficult for the flames to continue burning.
* Metaphorical Extension: Over time, the phrase "wet blanket" began to be used metaphorically to describe someone who dampens enthusiasm or excitement. Just as a wet blanket would extinguish a fire, a person who is a "wet blanket" would stifle the energy and joy of a group or situation.
Earliest Known Usage:
While the exact origin is difficult to pinpoint, the earliest known use of the phrase "wet blanket" in its metaphorical sense dates back to the 1800s. It's possible that the phrase gained popularity in the early 20th century due to its use in popular literature and media.
In Conclusion:
The term "wet blanket" likely arose from the practice of using wet blankets to extinguish fires, which then transitioned into a metaphorical description of someone who dampens enthusiasm or excitement.