Etymology
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keg (n.)

1630s, earlier kag (mid-15c.), from a Scandinavian source such as Old Norse kaggi "keg, cask," of unknown origin. Cognate with Swedish kagge, Norwegian kagg. Specific sense of "small or half barrel of beer" is from 1945. U.S. student slang kegger "party featuring a keg of beer" attested by 1969.

updated on March 02, 2016

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Definitions of keg from WordNet

keg (n.)
the quantity contained in a keg;
Synonyms: kegful
keg (n.)
small cask or barrel;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.