Webster’s Revised Unabridged Dictionary · 1913
Clough
Clough (klŭf), n. [OE. clough, cloghe, clou, clewch, AS. (assumed) clōh, akin to G. klinge ravine.] 1. A cleft in a hill; a ravine; a narrow valley. Nares.
2. A sluice used in returning water to a channel after depositing its sediment on the flooded land. Knight.
Clough, n. (Com.) An allowance in weighing. See Cloff.