To emit by, or as by, flood gates. [R.] Milton. To wet copiously, as by opening a sluice; as, to sluice meadows. Howitt. He dried his neck and face, which he had been sluicing with cold water. De Quincey. To wash with, or in, a stream of water running through a sluice; as, to sluice eart or gold dust in mining.