back·set /ˈbækˌsɛt/
倒退,逆流,渦流
Back·set n.
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. t. To plow again, in the fall; -- said of prairie land broken up in the spring. [Western U.S.]
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