chock

chock (http://definr.com/chock)

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