Source : Webster's Revised Unabridged Dictionary (1913)

Imbrute \Im*brute"\, v. t. [imp. & p. p. {Imbruted}; p. pr. &
   vb. n. {Imbruting}.] [Pref. im- in + brute: cf. F. abrutir.
   Cf. {Embrute}.]
   To degrade to the state of a brute; to make brutal.

         And mixed with bestial slime, THis essence to incarnate
         and imbrute.                             --Milton.