1) Superimpose 
Impression with new dies on a previously struck coin.
In typography, overstrike is a method of printing characters that are missing from the printer`s character set. It was widely used around the early 1990s{cn|date=September 2014}{by whom|date=September 2014}. The character was created by placing one character on another one — for example, overstriking `L` with `-` resulted in printing a `Ł...[numismatics] In Numismatics overstrike refers to the image on a coin which has been coined more than once. Overstriking is done deliberately when the first strike is unsatisfactory, or accidentally if the blank slips out of place or if the dies judder, resulting in a slight doubling of the design. Sometimes old and worn coins were overstru...
• (v. t.) To strike beyond.
An impression made with different dies on a previously struck coin.
A method used in word processing to produce a character not in the typeface by superimposing two separate characters, e.g. forming a $ character using the S and l characters.
O`ver·strike' transitive verb To strike beyond. [ Obsolete]
Impression with new dies on a previously struck coin.