"narrow ledge," 1729, from French berme (17c.), from Old Dutch baerm "edge of a dike," probably related to brim (q.v.). In U.S., 19c., also the name for the bank of a canal opposite the tow path.
A nearly horizontal or landward-sloping portion of a beach formed by the deposition of sediment by storm waves. A beach may have no berm at all, or it may have more than one berm.
A narrow man-made ledge or shelf, as along the top or bottom of a slope.