Source : Webster's Revised Unabridged Dictionary (1913)

Dastardize \Das"tard*ize\, v. t. [imp. & p. p. {Dastardized}; p.
   pr. & vb. n. {Dastardizing}.]
   To make cowardly; to intimidate; to dispirit; as, to
   dastardize my courage. --Dryden.