“Sluice” has the following definitions: (1) An artificial passage for water fitted with a valve or gate for stopping or regulating flow. (2) A dock gate. (3) A channel to drain or carry off surplus water. (4) A long inclined trough usually on the ground; such a contrivance paved usually with riffles to hold quicksilver for catching gold.

Machine Brief:
sluice= SLAOUS