Source : Webster's Revised Unabridged Dictionary (1913)

Skid \Skid\, v. i.
   1. To slide without rotating; -- said of a wheel held from
      turning while the vehicle moves onward.

   2. To fail to grip the roadway; specif., to slip sideways on
      the road; to side-slip; -- said esp. of a cycle or
      automobile.

Skid \Skid\, n.
   1. (A["e]ronautics) A runner (one or two) under some flying
      machines, used for landing.

Skid \Skid\, v. t. (Forestry)
   To haul (logs) to a skid and load on a skidway.

Skid \Skid\, v. t. [imp. & p. p. {Skidded}; p. pr. & vb. n.
   {Skidding}.]
   1. To protect or support with a skid or skids; also, to cause
      to move on skids.

   2. To check with a skid, as wagon wheels. --Dickens.

Skid \Skid\ (sk[i^]d), n. [Icel. sk[=i][eth] a billet of wood.
   See {Shide}.] [Written also {skeed}.]
   1. A shoe or clog, as of iron, attached to a chain, and
      placed under the wheel of a wagon to prevent its turning
      when descending a steep hill; a drag; a skidpan; also, by
      extension, a hook attached to a chain, and used for the
      same purpose.

   2. A piece of timber used as a support, or to receive
      pressure. Specifically:
      (a) pl. (Naut.) Large fenders hung over a vessel's side to
          protect it in handling a cargo. --Totten.
      (b) One of a pair of timbers or bars, usually arranged so
          as to form an inclined plane, as form a wagon to a
          door, along which anything is moved by sliding or
          rolling.
      (c) One of a pair of horizontal rails or timbers for
          supporting anything, as a boat, a barrel, etc.

Source : WordNet®

skid
     n 1: one of a pair of planks used to make a track for rolling or
          sliding objects
     2: a restraint provided when the brake linings are moved
        hydraulically against the brake drum to retard the wheel's
        rotation [syn: {brake shoe}, {shoe}]
     3: an unexpected slide [syn: {slip}, {sideslip}]
     [also: {skidding}, {skidded}]

skid
     v 1: slide without control; "the car skidded in the curve on the
          wet road"
     2: elevate onto skids
     3: apply a brake or skid to
     4: move obliquely or sideways, usually in an uncontrolled
        manner; "the wheels skidded against the sidewalk" [syn: {slip},
         {slue}, {slew}, {slide}]
     [also: {skidding}, {skidded}]