n. One whose occupation is the making of barrels, tubs, and other vessels formed of staves and hoops.n. [So called from the practice at breweries of allowing the coopers a daily portion of stout and porter. Cf. porter, a malt liquor.] A popular London beverage, consisting half of stout and half of porter.To do the work of a cooper; make barrels, hogsheads, casks, etc.To mend or put in order: as, to cooper casks.