grog
Concise Oxford English Dictionary © 2008 Oxford University Press:
grog/ɡrɒɡ/
▶noun spirits (originally rum) mixed with water.
■ informal or Austral./NZ alcoholic drink.
– origin C18: said to be from Old Grog, the nickname (because of his grogram cloak) of Admiral Vernon, who ordered diluted (instead of neat) rum to be served to sailors.
'grog' also found in these Oxford entries:

