A water cooler is a machine that dispenses drinking water, especially in an office. Standing around the water cooler at work, the subject of football comes up. 2. singular noun. Water cooler is used in expressions that refer to the informal conversations that people have in their office or workplace. A water dispenser, known as water cooler, is a machine that dispenses and often also cools or heats up water with a refrigeration unit. It is commonly located near the restroom due to closer access to plumbing. A drain line is also provided from the water cooler into the sewer system.

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