tun/tʌn; tʌn/ n1 large cask for beer, wine, etc （装啤酒、 葡萄酒等的）大酒桶.2 measure of capacity (216 gallons of beer or 252 gallons of wine) 容量单位（指啤酒为 216 加仑; 指葡萄酒为 252 加仑）.
牛津英汉双解词典