Definitions of chock:

• noun:   a block of wood used to prevent the sliding or rolling of a heavy object
• verb:   support on chocks

  Example: "Chock the boat"

• verb:   secure with chocks
• adverb:   as completely as possible

  Example: "It was chock-a-block full"

• name:  A surname (very rare: popularity rank in the U.S.: #22380)