noun
a device or container for keeping things cool, especially a refrigerator or an insulated box
adjective
comparative form of the adjective 'cool', meaning having a lower temperature or being more refreshing
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The new office building is equipped with a state-of-the-art water cooler.
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I'll grab us some drinks from the cooler before we head to the park.
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That party was so cool, I heard they had a sick cooler with all kinds of drinks.
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His calm demeanor in the face of adversity made him seem like a cooler head than the rest of us.