Definitions
1.verbTo emit by, or as by, flood gates.
2.verbTo wet copiously, as by opening a sluice"to sluice meadows"
3.verbTo wash with, or in, a stream of water running through a sluice.
4.verb(more generally) To wash (down or out).
5.verbTo flow, pour.
6.verbTo elide the C` in a coordinated wh-question. See sluicing.