grog
n
1 diluted spirit, usually rum, as an alcoholic drink
2 Informal (chiefly Austral. and N.Z.) alcoholic drink in general, esp. spirits (C18: from Old Grog, nickname of Edward Vernon (1684--1757), British admiral, who in 1740 issued naval rum diluted with water; his nickname arose from his grogram cloak)
sly grog
n (Austral. and N.Z.)
old-fashioned illicitly sold liquor