Etymology From Dutch berm (“strip of roadside grass, verge”), probably via French berme, from Middle Dutch barm, baerm, barem (“verge, bank”), from Old Dutch *barm, from Proto-West Germanic *barm, from Proto-Germanic *barmaz (“edge, border, seam”).
A narrow ledge or shelf, as along the top or bottom of a slope.
2
A raised bank or path, especially the bank of a canal opposite the towpath.
The big canals in Europe, in Holland, have a great big berm on the side of the canal several feet wide, which they leave there on purpose to plant reeds in, so as to get a reedy vegetation to protect their slope. Then, beyond that, there is an earthen slope that is grassed and sodded.1910 February 23, U.S. House of Representatives Committee on Agriculture, Protection of Watersheds of Navigable Streams, page 139:
Etymology From Dutch berm (“strip of roadside grass, verge”), probably via French berme, from Middle Dutch barm, baerm, barem (“verge, bank”), from Old Dutch *barm, from Proto-West Germanic *barm, from Proto-Germanic *barmaz (“edge, border, seam”).