Clough

• (n.) A sluice used in returning water to a channel after depositing its sediment on the flooded land. • (n.) A cleft in a hill; a ravine; a narrow valley. • (n.) An allowance in weighing. See Cloff.
Found on http://thinkexist.com/dictionary/meaning/clough/

Clough

Clough noun [ Middle English clough , cloghe , clou , clewch , Anglo-Saxon (assumed) clōh , akin to German klinge ravine.] 1. A cleft in a hill; a ravine; a narrow valley. Nares. 2. A sluice used in returning water to a channe...
Found on http://www.encyclo.co.uk/webster/C/95

clough

ravine; trench; gully
Found on http://phrontistery.info/c.html
No exact match found