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What is the dent in the bottom of a bottle of wine?

The dent on the bottom of a wine bottle is called a punt. It is found on the bottom of Champagne/sparkling wine bottles and many still wine bottles. The main purpose of the rounded bottom or punt is to strengthen the bottle--especially important for sparkling wines--but punts also can be useful for collecting sediment and for pouring wine (it provides a place to put your thumb).

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