Etymology
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unbar (v.)

late 14c., from un- (2) "reverse, opposite of" + bar (v.). Related: Unbarred; unbarring.

updated on February 25, 2014

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Definitions of unbar from WordNet

unbar (v.)
remove a bar from (a door);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.