Meaning

noun the quantity contained in a keg

noun small cask or barrel

originFrom Middle English kag, from Old Norse kaggi (“keg”), likely a diminutive of Proto-Germanic *kagô (“bush, branch, stalk, stump”). Cognate with Icelandic kaggi (“keg; cask”), Norwegian kagg (“keg”), Swedish kagge (“keg”), Low German kag (“vessel; craft”), Dutch kaag (“vessel; craft”). Compare also English cag and chag. The modern form keg with /ɛ/ is due to a dialectal raising of /a///æ/ to /ɛ/…

Etymology from Wiktionary, CC BY-SA 3.0