The Collaborative International Dictionary
Shack \Shack\, n. [Cf. Scot. shag refuse of barley or oats.]
The grain left after harvest or gleaning; also, nuts which have fallen to the ground. [Prov. Eng.]
Liberty of winter pasturage. [Prov. Eng.]
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A shiftless fellow; a low, itinerant beggar; a vagabond; a tramp. [Prov. Eng. & Colloq. U.S.]
--Forby.All the poor old shacks about the town found a friend in Deacon Marble.
--H. W. Beecher.These miserable shacks are so low that their occupants cannot stand erect.
--D. C. Worcester.Common of shack (Eng.Law), the right of persons occupying lands lying together in the same common field to turn out their cattle to range in it after harvest.
--Cowell.
Wiktionary
n. (context UK legal English) The right of persons occupying lands lying together in the same common field to turn out their cattle to range in it after harvest.