berm (n.)youdaoicibaDictYouDict[berm 词源字典]
"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.[berm etymology, berm origin, 英语词源]