Webster's English Dictionary

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chock

1. chock \'cha:k\ n [origin unknown] 1: a wedge or block for steadying a 
   body (as a cask) and holding it motionl ess, for filling in an unwanted 
   space, or for blocking the movement of a wheel 2: a heavy metal casting 
   with two short horn-shaped arms curving inward bet ween which ropes or 
   hawsers may pass for mooring or towing
2. chock vt : to provide, stop, or make fast with or as if with chocks 
3. chock av : as close or as completely as possible