<p><strong>Noun:</strong></p><ul><li>a large cask, especially one containing from 63 to 140 gallons (238 to 530 liters)</li><li>any of various units of liquid measure, especially one equivalent to 63 gallons (238 liters)</li></ul><p><strong>Verb:</strong></p><ul><li>to place or store in a tun or tuns</li></ul>