From The Collaborative International Dictionary of English v.0.48 [gcide]:
Debar \De*bar"\, v. t. [imp. & p. p. Debarred; p. pr. & vb. n.
Debarring.] [Pref. de- + bar.]
To cut off from entrance, as if by a bar or barrier; to
preclude; to hinder from approach, entry, or enjoyment; to
shut out or exclude; to deny or refuse; -- with from, and
sometimes with of.
[1913 Webster]
Yet not so strictly hath our Lord imposed
Labor, as to debar us when we need
Refreshment. --Milton.
[1913 Webster]
Their wages were so low as to debar them, not only from
the comforts but from the common decencies of civilized
life. --Buckle.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
debar
v 1: bar temporarily; from school, office, etc. [syn: suspend,
debar]
2: prevent the occurrence of; prevent from happening; "Let's
avoid a confrontation"; "head off a confrontation"; "avert a
strike" [syn: debar, forefend, forfend, obviate,
deflect, avert, head off, stave off, fend off,
avoid, ward off]
3: prevent from entering; keep out; "He was barred from
membership in the club" [syn: bar, debar, exclude]