mudhole

A place full of mud; a spot where there is mud of considerable depth; a depression where water and mud stand, as in a road.

In steam-engines, an orifice with steamtight covering in the bottom of a boiler, through which the sediment is removed. Also mudvalve.

A salt-water lagoon in which whales are captured.

A soft spot in granite due to decomposition.

A hole, or hollow place, containing mud, as in a road.

A hole near the bottom, through which the sediment is withdrawn.

A hole full of mud, especially one in a road

A hole near the bottom of a steam boiler, through which the sediment is withdrawn.