Source : Webster's Revised Unabridged Dictionary (1913)

Rebuff \Re*buff"\, v. t. [imp. & p. p. {Rebuffed}; p. pr. & vb.
   n. {Rebuffing}.]
   To beat back; to offer sudden resistance to; to check; to
   repel or repulse violently, harshly, or uncourteously.