Source : Webster's Revised Unabridged Dictionary (1913)

Repoussage \Re*pous`sage"\, n. [F. See {Repouss['e]}.] (Art)
   Art or process of hammering out or pressing thin metal from
   the reverse side: (1) in producing repouss['e] work; (2) in
   leveling up any part of an etched plate that has been worked
   so as to cause a depression.