ˈkləf also ˈklau̇ noun
( -s )
Etymology: Middle English clough, cloge, clou, from (assumed) Old English clōh; akin to Old High German Clāh uelde, a place name, klingo, klinga ravine, mountain brook and perhaps to Old English clingan to cling — more at cling
: a cleft in a hill : a narrow valley : ravine