Source : Webster's Revised Unabridged Dictionary (1913)

But \But\, v. i. [imp. & p. p. {Butted}; p. pr. & vb. n.
   {Butting}.]
   See {Butt}, v., and {Abut}, v.

Butt \Butt\, v. i. [imp. & p. p. {Butted}; p. pr. & vb. n.
   {Butting}.] [OE. butten, OF. boter to push, F. bouter. See
   {Butt} an end, and cf. {Boutade}.]
   1. To join at the butt, end, or outward extremity; to
      terminate; to be bounded; to abut. [Written also {but}.]

            And Barnsdale there doth butt on Don's well-watered
            ground.                               --Drayton.

   2. To thrust the head forward; to strike by thrusting the
      head forward, as an ox or a ram. [See {Butt}, n.]

            A snow-white steer before thine altar led, Butts
            with his threatening brows.           --Dryden.