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"

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "chock":
   arrest, bar, barricade, bearing rein, bit, block, block up,
   blockade, bolt, brake, brim, chain, charge, check, checkrein,
   choke, choke off, clog, close, close off, close tight, close up,
   congest, constrict, countercheck, cram, crowd, curb, curb bit,
   damper, debar, dog, doorstop, drag, drag sail, drift anchor,
   drift sail, drogue, fetter, fill, fill to overflowing, fill up,
   freight, holdback, jam, jam-pack, lade, load, lock, martingale,
   obstruct, occlude, overfill, pack, pad, pelham, ram in, remora,
   satiate, saturate, scotch, sea anchor, shackle, shut off, shut out,
   shut tight, snaffle, spoke, squeeze, squeeze shut, stay, stifle,
   stop, stop up, strangle, strangulate, stuff, suffocate,
   supercharge, surfeit, top off, trammel, wad, weight