The side of a canal opposite to the towpath. “Birm” or “berm” is a word used in fortification. (N.E.D.)
1854. Mr. Duane of Philadelphia (“Uneda”) made inquiry as to this word.—Notes and Queries, 1 S. ix. 12.
1883. The horse plunged over the berm bank into the bed of the canal.—Williamsport (Pa.) Gazette, March 30.
