To wash (down or out).
To flow, pour.
To elide the complement in a coordinated wh-question. See sluicing.
To emit by, or as by, flood gates.
To wet copiously, as by opening a sluice
To wash with, or in, a stream of water running through a sluice.
The stream flowing through a floodgate.
A water gate or floodgate.
A long box or trough through which water flows, used for washing auriferous earth.
An instance of wh-stranding ellipsis, or sluicing.
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.
Hence, an opening or channel through which anything flows; a source of supply.