Sluice \Sluice\, v. t. [imp. & p. p. {Sluiced}; p. pr. & vb. n. {Sluicing}.] 1. To emit by, or as by, flood gates. [R.] --Milton. 2. 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. 3. To wash with, or in, a stream of water running through a sluice; as, to sluice eart or gold dust in mining.