debar

(verb) bar temporarily; from school, office, etc.. Synonyms: suspend.

(verb) prevent the occurrence of; prevent from happening. Synonyms: forefend, forfend, obviate, deflect, avert, head off, stave off, fend off, avoid, ward off. Examples: "Let's avoid a confrontation." "Head off a confrontation." "Avert a strike."

(verb) prevent from entering; keep out. Synonyms: bar, exclude. Example: "He was barred from membership in the club."