Mash  —n. 1 soft or confused mixture. 2 mixture of boiled grain, bran, etc., fed to horses etc. 3  colloq. Mashed potatoes. 4 mixture of malt and hot water used in brewing. 5 soft pulp made by crushing, mixing with water, etc. —v. 1 crush (potatoes etc.) To a pulp. 2 dial. A infuse (tea). B (of tea) draw.  masher n. [old english]