°An artificial passage for water, fitted with a valve or gate, as in a mill stream, for stopping or regulating the flow; also, a water gate of flood gate.
°Hence, an opening or channel through which anything flows; a source of supply.
verb
°To emit by, or as by, flood gates. -Milton.
°To wet copiously, as by opening a sluice; as, to sluice meadows. Howitt.