dredging

A kind of chain pump, or dredging machine.

a dredging bucket with hinges like the shell of a clam

A dredging machine for excavating canals, etc.

a barge (or a vessel resembling a barge) that is used for dredging

plural of dredging v cover before cooking v search (as the bottom of a body of water) for something valuable or lost v remove with a power shovel, usually from a bottom of a body of water