overstrike
noun
1. (numismatics) A coin that has been overstruck, i.e. coined more than once. [from 20th c.]
2. (typography) The printing of one character over another, as - on top of L to produce Ł. [from 20th c.]
3. (computing, uncountable) overtype (feature where input replaces existing characters instead of being inserted before them)
verb
1. (obsolete, reflexive) To overreach oneself while striking. [16th c.]
2. (transitive) 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.]
3. (transitive) To strike (something) too hard. [from 20th c.]