Definitions
1.nounAn 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.
2.nounA water gate or floodgate.
3.nounHence, an opening or channel through which anything flows; a source of supply.
4.nounThe stream flowing through a floodgate.
5.nounA long box or trough through which water flows, used for washing auriferous earth.
6.nounAn instance of wh-stranding ellipsis, or sluicing.