\Back"set`\, n. [Back, adv. + set.]
1. A check; a relapse; a discouragement; a setback.
2. Whatever is thrown back in its course, as water. Slackwater, or the backset caused by the overflow. --Harper's Mag.
\Back"set`\, v. i. To plow again, in the fall; -- said of prairie land broken up in the spring. [Western U.S.]