Real Dictionary

sluice
countable noun: A sluice is a passage that carries a current of water and has a barrier, called a sluice gate, which can be opened and closed to control the flow of water.
verb: If you sluice something or sluice it down or out, you wash it with a stream of water.

sluice in American English
an artificial channel or passage for water, having a gate or valve at its head to regulate the flow, as in a canal or millstream
to draw off by or as by means of a sluice
intransitive verb: to flow or pour through or as if through a sluice
noun: an artificial channel for conducting water, often fitted with a gate (sluice gate) at the upper end for regulating the flow
transitive verb: to let out (water) by or as if by opening a sluice

sluice in British English
noun: a channel that carries a rapid current of water, esp one that has a sluicegate to control the flow
verb: to draw out or drain (water, etc) from (a pond, etc) by means of a sluice