Main entry: bar, debar, exclude
Definition: prevent from entering; keep out
Usage: He was barred from membership in the club
Main entry: forefend, forfend, fend off, stave off, avert, avoid, obviate, debar, deflect, ward off, head off
Definition: prevent the occurrence of; prevent from happening
Usage: Let's avoid a confrontation; head off a confrontation; avert a strike
Definition: bar temporarily; from school, office, etc.