n. 挫折, 倒退, 逆流, 涡流

Backset \Back"set`\ (b[a^]k"s[e^]t`), 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.


Backset \Back"set`\, v. t.
To plow again, in the fall; -- said of prairie land broken up
in the spring. [Western U.S.]