<p><strong>Noun</strong></p><ul><li>an artificial channel for conducting water, often fitted with a gate sluice gate at the upper end for regulating the flow</li><li>the body of water held back or controlled by a sluice gate</li><li>any contrivance for regulating a flow from or into a receptacle</li><li>a channel, especially one carrying off surplus water; drain</li><li>a stream of surplus water</li><li>an artificial stream or channel of water for moving solid matter: a lumbering sluice</li><li>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</li></ul><p><strong>Verb</strong></p><ul><li>to let out (water) by or as if by opening a sluice</li><li>to drain (a pond, lake, etc.) by or as if by opening a sluice</li><li>to open a sluice upon</li><li>to flush or cleanse with a rush of water: to sluice the decks of a boat</li><li>Mining. to wash in a sluice</li><li>to send (logs) down a sluiceway</li></ul>