round or oval holes in a vessels bulwark, sometimes fitted with rollers, through which hawsers and ropes are passed; also blocks of wood for supporting boats, weights, and so on
Any fitting or fixture used to restrict movement, especially movement of a line; traditionally was a fixture near a bulwark with two horns pointing towards each other, with a gap between where the line can be inserted
a block of wood used to prevent the sliding or rolling of a heavy object support on chocks; "chock the boat" secure with chocks as completely as possible; "it was chock-a-block full