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See more synonyms for backset on Thesaurus.com
  1. New England, Southern, and South Midland U.S.
    1. a setback; relapse; reverse.
    2. an eddy or countercurrent.
  2. (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.
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Origin of backset

First recorded in 1565–75; back2 + set
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples