[black and tan] n (1870) 1: a black-and-tan animal (as a dog)
2. chiefly Brit: a drink consisting of a dark beer (as stout or porter) and ale or beer 3 cap B&T [fr. the color of his uniform]: a recruit enlisted in England in 1920-21 for service in the Royal Irish Constabulary against the armed movement for Irish independence
4: a member of a black-and-tan political organization (as in the southern U.S.)--compare lily-white