The Collaborative International Dictionary of English v.0.48:

But \But\, v. i. [imp. & p. p. Butted; p. pr. & vb. n.
   Butting.]
   See Butt, v., and Abut, v.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
      [1913 Webster]

            And Barnsdale there doth butt on Don's well-watered
            ground.                               --Drayton.
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   2. To thrust the head forward; to strike by thrusting the
      head forward, as an ox or a ram. [See Butt, n.]
      [1913 Webster]

            A snow-white steer before thine altar led,
            Butts with his threatening brows.     --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Butting \But"ting\, n.
   An abuttal; a boundary.
   [1913 Webster]

         Without buttings or boundings on any side. --Bp.
                                                  Beveridge.
   [1913 Webster]