What is Blank Bar?

Legal Definition
Pleading. The same with that called a common bar, whicb, in an action of trespass, is put in to oblige the plaintiff to assign the certain' place where the trespass was committed. Cro. Jac. 594, pl. 16.
-- Bouviers Law Dictionary
Legal Definition
Also called the "common bar." The name of a plea in bar which in an action of trespass is put in to oblige the plaintiff to assign the certain place where the trespass was committed. It was most in practice in the common bench. See Cro. Jac. 594.
-- Black's Law Dictionary
Legal Definition
Common bar, which see.
-- Ballentine's Law Dictionary