1. [n]  an unexpected slide
2. [n]  one of a pair of planks used to make a track for rolling or sliding objects
3. [v]  move obliquely or sideways, usually in an uncontrolled manner; "the wheels skidded against the sidewalk"
4. [v]  slide without control, as of a car that does not grip the road
5. [v]  apply a brake or skid to
6. [v]  elevate onto skids

SKID is a 4 letter word that starts with S.

1. \Skid\, n.
   1. (A["e]ronautics) A runner (one or two) under some flying
      machines, used for landing.
   
   
   
   2. [From the v.] Act of skidding; -- called also {side slip}.
   
   

2. \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.
   
   

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

4. \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.
   
   
   
   

5. \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.