U.S. ? Obs. [UNDER-1 5 b, with obscure second element.] ‘A cut on the under side’ of an animal’s ear as a mark of ownership.
1783. Maryland Jrnl., 4 Feb. (Thornton). A crop in [a cow’s] left ear, and an underkeel in her right. Ibid. (1784), 27 Jan. The right ear a crop and slit, the left a slit and underkeel.
