The Collaborative International Dictionary
Backset \Back"set`\ (b[a^]k"s[e^]t`), n. [Back, adv. + set.]
A check; a relapse; a discouragement; a setback.
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Whatever is thrown back in its course, as water.
Slackwater, or the backset caused by the overflow.
--Harper's Mag.
Backset \Back"set`\, v. t. To plow again, in the fall; -- said of prairie land broken up in the spring. [Western U.S.]
Wiktionary
n. 1 A check; a relapse; a discouragement; a setback. 2 Whatever is thrown back in its course, such as water. vb. (context US Western US English) To plow again in the fall; said of prairie land broken up in the spring.
Usage examples of "backset".
After a peek out the door in case Carl was around (she'd thought she heard him earlier--and damn near wet her pants), she hurried to her car and put the suitcase in the backset.
He's had backsets, but in the end he's succeeded in everything he's tried.