from
The Collaborative International Dictionary of English v.0.48
Brain \Brain\ (br[=a]n), v. t. [imp. & p. p. {Brained}
(br[=a]nd); p. pr. & vb. n. {Braining}.]
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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.
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There thou mayst brain him. --Shak.
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It was the swift celerity of the death . . .
That brained my purpose. --Shak.
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2. To conceive; to understand. [Obs.]
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'T is still a dream, or else such stuff as madmen
Tongue, and brain not. --Shak.
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