Fetching details from the dictionary...

sake cup; cup for alcoholic beverages
茶会の主人が銀の坏に酒を注いでくれた。
The host of the tea gathering poured sake into a silver cup for me.
古代の遺跡から土製の坏が多数見つかった。
Numerous earthen cups were found at the ancient site.
坏を傾けながら月を愛でるのが風流とされた。
It was considered elegant to appreciate the moon while tilting a sake cup.