A combe (m; also spelled coombe or coomb and, in place names, comb) can either refer to a steep, narrow valley, or to a small valley or large hollow on the side of a hill; in any case, it is often understood simply to mean a small valley through which a watercourse does not run. The word `combe` is derived from Old English cumb, of the same mean.....
• (n.) See Comb. • (n.) That unwatered portion of a valley which forms its continuation beyond and above the most elevated spring that issues into it.
Combe noun See Comb . 
Steep-sided valley found on the scarp slope of a chalk escarpment. The inclusion of `combe` in a placename usually indicates that the underlying rock is chalk
A hollow or short valley in the side of limestone uplands or chalk down lands in southern England.
a narrow valley or deep hollow, esp. one enclosed on all but one side.