Overstrike definitions

(1) To type over an existing character.
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To cover up (a design, mark etc.) by stamping another on top of it; to superimpose a mark or logo on (a coin, stamp, etc.). [from 20th c.]
verb
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To strike (something) too hard. [from 20th c.]
verb
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(numismatics) A coin that has been overstruck, i.e. coined more than once. [from 20th c.]
noun
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(typography) The printing of one character over another, as - on top of L to produce Ł. [from 20th c.]
noun
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(computing, uncountable) Overtype (feature where input replaces existing characters instead of being inserted before them)
noun
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Origin of overstrike

From over- +"Ž strike.