1. A cleft in a hill; a ravine; a narrow valley
   "The hikers followed the clough to reach the hidden waterfall"
    
2. A sluice used in returning water to a channel after depositing its sediment on the flooded land
   "The clough helped control water flow in the irrigation system"
    
3. An allowance in weighing, especially in the coal trade
   "The merchant included a clough in the weight to account for possible discrepancies"

Derived forms: cloughs

Encyclopedia: Clough, Peter