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Meaning of overstrike

o•ver•strike

Pronunciation: (v.ō"vur-strīk'n.ō'vur-strīk"), [key]
— v., n. -struck, -strik•ing,
—v.t.
  1. to stamp a new device, value, or inscription on (a coin).
—n.
  1. a coin that has been overstruck without complete obliteration of the original design.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.