an iced drink made from gin and water, sweetened, and flavoured with lemon or lime juice
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for gin sling
Historical Examples of gin sling
He was amazed; for whatever his fondness might have been for gin-sling, it was not his habit to put it on the table.
Then for "gin-sling" he read "gunning," and "gun sing," and "grinning," all of course to be abandoned in their turn.