Definition of "swig"

As sucking Colts leap when they swig the Teat

1684, Thomas Creech, Idylliums of Theocritus

Jerry put his brandy bottle at the side of his pillow,—kindly informing him that he would have an opportunity of taking a few more swigs before he went down, for the water was only up to her bends at present.

1830, [Frederick Marryat], chapter XII, in The King’s Own. […], volume II, London: Henry Colburn and Richard Bentley, […], page 183

He looked up, however, at my coming, knocked the neck off the bottle like a man who had done the same thing often, and took a good swig, with his favourite toast of "Here's luck!"

1881–1882, Robert Louis Stevenson, “Israel Hands”, in Treasure Island, London, Paris: Cassell & Company, published 14 November 1883, part V (My Sea Adventure), pages 219–220

And he took the last swig out of the pint.

1922 February, James Joyce, “[Episode 12: The Cyclops]”, in Ulysses, Paris: Shakespeare and Company, […]

Next, he opens up the cupboard over the sink and slams that shut too, only to open another cabinet door that houses what he's looking for, a glass. He pours it full of OJ and takes a huge swig, swallows, and repeats.

2014, Michael Griffo, Starfall (The Darkborn Legacy), New York, NY: Kensington Publishing Corporation, page 26