Verb
bar out (third-person singular simple present bars out, present participle barring out, simple past and past participle barred out)
- (transitive, literally) To keep (someone or something) from entering.
- (obsolete) To shut a teacher out of the classroom as a prank.
- Synonym: outbar
1913, G. K. Chesterton, “chapter 3”, in The Victorian Age in Literature:We feel that it is a disgrace to a man like Tennyson, when he talks of the French revolutions, the huge crusades that had recreated the whole of his civilisation, as being "no graver than a schoolboy's barring out."