Noah Webster's Dictionary 1. (v.) To grow broad; to become broader or wider. 2. (v. t.) To make broad or broader; to render more broad or comprehensive.

Multi-Version Concordance Broaden (1 Occurrence) Matthew 23:5 And all their works they do to be seen by men, and they make broad their phylacteries, and enlarge the fringes of their garments, (See NAS)