Etymology
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debar (v.)

early 15c., "to shut out, exclude" (from a place), also "prevent, prohibit" (an action), from French débarrer, from Old French desbarer (12c., which, however, meant only "to unbar, unbolt," from des- "do the opposite of" (see dis-) + barrer "to bar," from barre "bar" (see bar (n.1)). The meaning turned around in French as the de- was felt in a different sense, perhaps as an intensifier. Related: Debarment; debarred.

updated on July 04, 2018

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Definitions of debar from WordNet

debar (v.)
bar temporarily; from school, office, etc.;
Synonyms: suspend
debar (v.)
prevent the occurrence of; prevent from happening;
Synonyms: forefend / forfend / obviate / deflect / avert / head off / stave off / fend off / avoid / ward off
debar (v.)
prevent from entering; keep out;
Synonyms: bar / exclude
From wordnet.princeton.edu, not affiliated with etymonline.