ˈcock-ˌmetal [f. cock n.1] A soft alloy consisting of two parts of copper and one of lead, used esp. for cocks or taps, whence the name. 1822J. Imison Sci. & Art II. 228 Cock metal is made with copper alloyed with zinc and lead.1864AthenæumNo. 1937. 788/1 Casts in cock-metal.