CLOUGH

clough. Clough, n. a cliff, descent, allowance in weight

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Clough (?), n. [[OE. clough, cloghe, clou, clewch, AS. (assumed) clōh, akin to G. klinge ravine.]] 1. 1. A cleft in a hill; a ravine; a narrow valley. Nares.
2. 2. A sluice used in returning water to a channel after depositing its sediment on the flooded land. Knight.