a pit, well, or the like in which water or other liquid is collected.

Machinery . a chamber at the bottom of a machine, pump, circulation system, etc., into which a fluid drains before recirculation or in which wastes gather before disposal.

Mining .

a space where water is allowed to collect at the bottom of a shaft or below a passageway.

a pilot shaft or tunnel pushed out in front of a main bore.

British . crankcase.

British Dialect . a swamp, bog, or muddy pool.