Definitions from Wiktionary (sluice)

▸ noun:  An artificial passage for water, fitted with a valve or gate, for example in a canal lock or a mill stream, for stopping or regulating the flow.
▸ noun:  A water gate or floodgate.
▸ noun:  Hence, an opening or channel through which anything flows; a source of supply.
▸ noun:  The stream flowing through a floodgate.
▸ noun:  (mining) A long box or trough through which water flows, used for washing auriferous earth.
▸ noun:  (linguistics) An instance of wh-stranding ellipsis, or sluicing.
▸ verb:  (transitive, rare) To emit by, or as by, flood gates.
▸ verb:  (transitive) To wet copiously, as by opening a sluice
▸ verb:  (transitive) To wash with, or in, a stream of water running through a sluice.
▸ verb:  (transitive, more generally) To wash (down or out).
▸ verb:  (intransitive) To flow, pour.
▸ verb:  (linguistics) To elide the complement in a coordinated wh-question. See sluicing.

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