What does "repousse" mean?

Repousse: (a) Formed in relief, as a pattern on metal. (b) Ornamented with patterns in relief made by pressing or hammering on the reverse side; -- said of thin metal, or of a vessel made of thin metal. -- n. Repoussé work. Repoussé work, ornamentation of metal in relief by pressing or hammering on the reverse side.