sluice /sluːs/noun 6verb 6forms 3phrases 1 noun6 •An artificial passage for water, fitted with a valve or gate, for example in a canal lock or a mill stream, for stopping or regulating the flow. •A water gate or floodgate. •Hence, an opening or channel through which anything flows; a source of supply.At least, I'm sure I can fish it out of her. She's the very Sluce to her Lady's Secrets;—'Tis but setting her Mill agoing, and I can drein her of 'em all. — 1693 •A long box or trough through which water flows, used for washing auriferous earth. •The stream flowing through a floodgate. •An instance of wh-stranding ellipsis, or sluicing.Another powerful argument that sluices are CPs comes from the positional distribution of sluiced wh-phrases in a variety of languages. — 2001 verb6 •To wash with, or in, a stream of water running through a sluice. •To wash (down or out).[…] he did plot the Duke of Gloucester's death, / Suggest his soon-believing adversaries, / And consequently, like a traitor coward, / Sluiced out his innocent soul through streams of blood — 1595 •To flow, pour.In the trough behind the white wave / Helen shook her dark head, the water sluiced from her shoulders / And rose-tipped breasts. — 1932 •(rare) To emit by, or as by, flood gates. •To wet copiously, as by opening a sluiceNine - mile Creek has been dug out again and again , and has been sluiced three times — 1855 •To elide the complement in a coordinated wh-question. See sluicing. formssluiced · sluicing · sluices Phrases with sluice sluice outTo wash; to hose down