Boss

Chamber's Twientieth Century Dictionary · 1908 · p. 15

bos, n. a knob or stud: a raised ornament.— v.t. to ornament with bo es.— adj. Bo ′y , having bo es.— p.adj. Bo ed , embo ed. [O. Fr. boce (Fr. bo e ), from Old Ger. bôzan , to beat.]