New England, Southern, and South Midland U.S.
a setback; relapse; reverse.
an eddy or countercurrent.
(on a lock on a door or the like) the horizontal distance between the face through which the bolt passes and the center line of the knob stem or keyhole.

1565–75; back2 + set Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
We are making two changes related to the backset requirement.
Upstream-dipping backset laminae are not necessarily preserved.
Staff recommended that the farthest backset of stairs on the plan be eliminated.
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