Undersluice

noun
1.
an artificial channel for conducting water, often fitted with a gate (sluice gate) at the upper end for regulating the flow.
2.
the body of water held back or controlled by a sluice gate.
3.
any contrivance for regulating a flow from or into a receptacle.
4.
a channel, especially one carrying off surplus water; drain.
5.
a stream of surplus water.
6.
an artificial stream or channel of water for moving solid matter:
a lumbering sluice.
7.
Also called sluice box. Mining. a long, sloping trough or the like, with grooves on the bottom, into which water is directed to separate gold from gravel or sand.
verb (used with object), sluiced, sluicing.
8.
to let out (water) by or as if by opening a sluice.
9.
to drain (a pond, lake, etc.) by or as if by opening a sluice.
10.
to open a sluice upon.
11.
to flush or cleanse with a rush of water:
to sluice the decks of a boat.
12.
Mining. to wash in a sluice.
13.
to send (logs) down a sluiceway.
verb (used without object), sluiced, sluicing.
14.
to flow or pour through or as if through a sluice.
noun
1.
Also called sluiceway. a channel that carries a rapid current of water, esp one that has a sluicegate to control the flow
2.
the body of water controlled by a sluicegate
3.
See sluicegate
4.
(mining) an inclined trough for washing ore, esp one having riffles on the bottom to trap particles
5.
an artificial channel through which logs can be floated
6.
(informal) a brief wash in running water
verb
7.
(transitive) to draw out or drain (water, etc) from (a pond, etc) by means of a sluice
8.
(transitive) to wash or irrigate with a stream of water
9.
(transitive) (mining) to wash in a sluice
10.
(transitive) to send (logs, etc) down a sluice
11.
(intransitive; often foll by away or out) (of water, etc) to run or flow from or as if from a sluice
12.
(transitive) to provide with a sluice