The Collaborative International Dictionary of English v.0.48:

Chock \Chock\, v. t. [imp. & p. p. Chocked; p. pr. & vb. n.
   Chocking.]
   To stop or fasten, as with a wedge, or block; to scotch; as,
   to chock a wheel or cask.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chock \Chock\, v. i.
   To fill up, as a cavity. "The woodwork . . . exactly chocketh
   into joints." --Fuller.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chock \Chock\, n.
   1. A wedge, or block made to fit in any space which it is
      desired to fill, esp. something to steady a cask or other
      body, or prevent it from moving, by fitting into the space
      around or beneath it.
      [1913 Webster]

   2. (Naut.) A heavy casting of metal, usually fixed near the
      gunwale. It has two short horn-shaped arms curving inward,
      between which ropes or hawsers may pass for towing,
      mooring, etc.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chock \Chock\, adv. (Naut.)
   Entirely; quite; as, chock home; chock aft.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chock \Chock\, v. t. [F. choquer. Cf. Shock, v. t.]
   To encounter. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chock \Chock\, n.
   An encounter. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

chock
    adv 1: as completely as possible; "it was chock-a-block full"
           [syn: chock, chock-a-block]
    n 1: a block of wood used to prevent the sliding or rolling of a
         heavy object [syn: chock, wedge]
    v 1: secure with chocks
    2: support on chocks; "chock the boat"