A natural drain.
1884. When the game is first sighted, even though it be one, two, or three miles away, you must either dismount and picket your horse, or find cover in some coulee or draw, where you can ride entirely out of sight of the quarry.—G. O. Shields, ‘Antelope Hunting in Montana,’ Harper’s Magazine, lxix. pp. 364–5 (Aug.). (N.E.D.)
