A rick or stack of corn, straw, etc., in a barn. Also: the quantity of corn, straw, etc., stacked up and stored in one bay or division of a barn. Compare "hay-goaf", "mow". English regional (chiefly East Anglian) in later use.
"to ride the goaf": to ride a horse on top of a goaf in order to compress it and make it more compact. Now chiefly historical.
An empty space from which coal has been extracted in a longwall mine, sometimes filled with waste material.