Source : Webster's Revised Unabridged Dictionary (1913)

Crusade \Cru*sade"\, v. i. [imp. & p. p. {Crusaded}; p. pr. &
   vb. n. {Crusading}.]
   To engage in a crusade; to attack in a zealous or hot-headed
   manner. ``Cease crusading against sense.'' --M. Green.