Source : Webster's Revised Unabridged Dictionary (1913)

Calk \Calk\ (k[a^]lk), v. t. [E. calquer to trace, It. caicare
   to trace, to trample, fr. L. calcare to trample, fr. calx
   heel. Cf. {Calcarate}.]
   To copy, as a drawing, by rubbing the back of it with red or
   black chalk, and then passing a blunt style or needle over
   the lines, so as to leave a tracing on the paper or other
   thing against which it is laid or held. [Written also
   {calque}]

Calk \Calk\ (k[add]k), n. [Cf. AS. calc shoe, hoof, L. calx,
   calcis, heel, calcar, spur.]
   1. A sharp-pointed piece of iron or steel projecting downward
      on the shoe of a horse or an ox, to prevent the animal
      from slipping; -- called also {calker}, {calkin}.

   2. An instrument with sharp points, worn on the sole of a
      shoe or boot, to prevent slipping.

Calk \Calk\ (k[add]k), v. t. [imp. &p. p. {Calked}; p. pr. & vb.
   n. {Calking}.] [Either corrupted fr. F. calfater (cf. Pg.
   calafetar, Sp. calafetear), fr. Ar. qalafa to fill up
   crevices with the fibers of palm tree or moss; or fr. OE.
   cauken to tred, through the French fr. L. calcare, fr. calx
   heel. Cf. {Calk} to copy, Inculcate.]
   1. To drive tarred oakum into the seams between the planks of
      (a ship, boat, etc.), to prevent leaking. The calking is
      completed by smearing the seams with melted pitch.

   2. To make an indentation in the edge of a metal plate, as
      along a seam in a steam boiler or an iron ship, to force
      the edge of the upper plate hard against the lower and so
      fill the crevice.

Calk \Calk\ (k[add]k), v. i.
   1. To furnish with calks, to prevent slipping on ice; as, to
      calk the shoes of a horse or an ox.

   2. To wound with a calk; as when a horse injures a leg or a
      foot with a calk on one of the other feet.

Source : WordNet®

calk
     n : a metal cleat on the bottom front of a horseshoe to prevent
         slipping [syn: {calkin}]
     v 1: provide with calks; "calk horse shoes"
     2: seal with caulking; "caulk the window" [syn: {caulk}]
     3: injure with a calk