Etymology
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berm (n.)

"narrow ledge," 1729, from French berme (17c.), from Old Dutch baerm "edge of a dike," which is probably related to brim (q.v.). In U.S., especially "grass strip beside a road," originally the name for the bank of a canal opposite the tow path (1833; berm-bank is from 1832).

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Definitions of berm

berm (n.)
a narrow ledge or shelf typically at the top or bottom of a slope;
berm (n.)
a narrow edge of land (usually unpaved) along the side of a road;
Synonyms: shoulder
From wordnet.princeton.edu