The Collaborative International Dictionary of English v.0.48:
Sluice \Sluice\, v. t. [imp. & p. p. Sluiced; p. pr. & vb. n.
1. To emit by, or as by, flood gates. [R.] --Milton.
2. To wet copiously, as by opening a sluice; as, to sluice
He dried his neck and face, which he had been
sluicing with cold water. --De Quincey.
3. To wash with, or in, a stream of water running through a
sluice; as, to sluice eart or gold dust in mining.