medium-sized earthenware sake cup
A traditional ceramic sake cup of medium size, often used in casual drinking settings.
居酒屋で三度入りのお猪口が出てきた。
At the izakaya, they brought out a medium-sized earthenware sake cup.
The term likely derives from 三度 (three times) and 入り (containing), possibly referring to a cup size that holds about three servings or pours of sake. The exact origin is uncertain.