water cooler

noun
1.
a container for holding drinking water that is cooled and drawn off by a faucet or spigot.
2.
a drinking fountain in which water is cooled by mechanical refrigeration.

Origin:
1840–50, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
water cooler
 
n
1.  a device for cooling and dispensing drinking water
 
modifier
2.  informal
 a.  indicating the kind of informal conversation among office staff that takes place at such a dispenser: water-cooler conversations
 b.  indicating an event, television programme, etc, sufficiently controversial or otherwise noteworthy to provide subject matter for such conversations: water-cooler television; a water-cooler moment

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
And they should take the long way to return and refill the bottle at the water
  cooler on the way back.
It and several variations on the theme are great fodder for water cooler
  arguments.
If you don't let him check into the water cooler, he won't be happy.
We sit quietly hunched over laptops, transitioning even our water cooler
  conversations to our keyboards.
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