overstrike

Etymology
From.

Verb

 * 1)  To overreach oneself while striking.
 * 2)  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.).
 * 3)  To strike (something) too hard.
 * 1)  To strike (something) too hard.

Noun

 * 1)  A coin that has been overstruck, i.e. coined more than once.
 * 2)  The printing of one character over another, as - on top of L to produce Ł.
 * 3)  overtype (feature where input replaces existing characters instead of being inserted before them)