n. a cowboy who rides well out to the side of a herd to keep the animals from spreading.
See also: swing (def. 3)
- 1962  All went out to herd the cattle into the branding corral, Donnie riding as a swing-out at the side . . . swinging a rope and the way his father always did, spooking stray cows and calves out of the willow brush.