de·bar 
(dē-bär)
(dē-bär)tr.v. de·barred, de·bar·ring, de·bars
1. To exclude or shut out; bar.
2. To forbid, hinder, or prevent.
[Middle English debarren, from Old French desbarer, to unbar : des-, de- + barer, to bar (from barre, bar; see BAR1).]
de·barment n.