cold-hammer,v.Metallurgy.|ˈkəʊldˌhæmə(r)| trans. To hammer (iron, etc.) when cold. Hence cold-hammeringvbl.n. 1858Greener Gunnery 206 Beating them when hot improves them much, provided they be not heated again; but if they have been cold hammered, the injury is full 30 per cent.