strikeover

/ˈstraɪkˌoʊvər/
noun
  1. A key or function on a typewriter or computer keyboard that replaces existing characters with new ones typed over them.
    • I accidentally hit the strikeover key and lost my sentence.
    • On old typewriters, the strikeover feature let you correct mistakes by typing directly over them.
    • The word processor has a strikeover mode that overwrites text instead of inserting it.
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