Clough
Clough , noun
[Old 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 channel after depositing its sediment on the flooded land. — Knight
Clough (?; 115) , noun
(Commerce) An allowance in weighing. See Cloff.