n. A narrow valley; a cleft in a hillside; a ravine, glen, or gorge.n. A cliff; a rocky precipice.n. The cleft or fork of a tree.n. A wood.n. A sluice; especially, a sluice for letting off water gently, as in the agricultural operation of improving soils by flooding them with muddy water. Also clow.n. A large vessel of coarse earthenware.n. See cloff.