a. An artificial channel for conducting water, with a valve or gate to regulate the flow: sluices connecting a reservoir with irrigated fields.
b. A valve or gate used in such a channel; a floodgate: open sluices to flood a dry dock. Also called sluice gate.
2. A body of water impounded behind a floodgate.
3. A sluiceway.
4. A long inclined trough, as for carrying logs or separating gold ore.
v.sluiced, sluic·ing, sluic·es
v.tr.
1. To flood or drench with or as if with a flow of released water.
2. To wash with water flowing in a sluice: sluicing sediment for gold.
3. To draw off or let out by a sluice: sluice floodwater.
4. To send (logs, for example) down a sluice.
v.intr.
To flow out from or as if from a sluice.
[Middle English scluse, from Old French escluse, from Late Latin exclsa, from Latin, feminine past participle of excldere, to shut out; see exclude.]
sluice /slus/ n.1 a machine that controls the flow of water into or out of a lake, river, etc. 2 the flow itself v. [I] sluiced, sluicing, sluices to send a flow of water: I washed the soap off as the water sluiced over my body.
v. [I] sluiced, sluicing, sluices to send a flow of water: I washed the soap off as the water sluiced over my body. 
s)
sa, from Latin, feminine past participle of excl