a wedge or block of wood, metal, or the like, for filling in a space, holding an object steady, etc.

Nautical .

any of various heavy metal fittings on a deck or wharf that serve as fairleads for cables or chains.

a shaped support or cradle for a ship's boat, barrel, etc.

a small wooden piece or timber for filling a gap, reinforcing an angle, etc., in a wooden vessel.

Metalworking . a bearing supporting the end of a rolling mill.

Mining . a roof support made of cribbing filled with stones. Compare cog 3 ( def. 2 ) .

to furnish with or secure by a chock or chocks.

Nautical . to place (a boat) upon chocks.

as close or tight as possible

chock against the edge.