Panjandrum,panjandrum said:A nip of rum is a common enough phrase, as is a nip of whiskey (or whisky). It may be old-fashioned, but it is still in regular use here, and in the dustier corners of Google (in the snug, one might say).
The sense of slang for AE-speakers may come from the term nip-joint, US slang for an establishment that provided the odd nip for its customers way back in the days of prohibition. Nip joint appears to have some occasional more modern use, See Here.
"Nip" of alcohol is somewhat old-fashioned, usually from a metal flask, offered covertly, in cold weather, for 'medicinal' purposes.Others mentioned that in New England, and possibly in other places, "nip" is a term for the smallest bottle of spirits or a miniature (though the old slang term "nip joint" recorded in the OED - an establishment illegally selling small amounts of spirits - would now seem to be defunct).
Indeed, preferably, oh, let's say 16 years old?french4beth said:[...] "Nip" of alcohol is somewhat old-fashioned, usually from a metal flask, offered covertly, in cold weather, for 'medicinal' purposes.
By 'England' I assume you mean 'Britain' we Scots, the Welsh and Northern Irish tend to get rather annoyed at the failure of foreigners to comprehend the difference.While the word itself might not be slang, it is sometimes used in a slang context. Perhaps it is a more common word in England?
If I read, "Say, Lassie, would you care to share a nip with me." I would expect that the conversation was in England (or Scotland, Wales, Ireland, etc.), and not in the USA.