To Sluice

1. (transitive, rare) To emit by, or as by, flood gates.
2. (transitive) To wet copiously, as by opening a sluice
3. (transitive) To wash with, or in, a stream of water running through a sluice.
4. (transitive, more generally) To wash (down or out).
5. (intransitive) To flow, pour.
6. (linguistics) To elide the complement in a coordinated wh-question.