Origin of cwm
Examples from the Web for cwms
The break in the ridge may be reached either by following the ridge itself or from the cwms on either side of it.
The howling of the winds in the cwms and dingles which run down the p. 13mountain on every side was really appalling.
The moaning of the wind in the great mountain gullies and cwms rendered the scene both awful and sublime.
These cwms are occasionally visited for the sake of the waterfalls, two or three of which are exceedingly fine.
1853, from Welsh cwm "coomb" (see coomb).