Brain \Brain\, v. t. [imp. & p. p. {Brained}; p. pr. & vb. n. {Braining}.] 1. To dash out the brains of; to kill by beating out the brains. Hence, Fig.: To destroy; to put an end to; to defeat. There thou mayst brain him. --Shak. It was the swift celerity of the death . . . That brained my purpose. --Shak. 2. To conceive; to understand. [Obs.] ?T is still a dream, or else such stuff as madmen Tongue, and brain not. --Shak.