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backspace (adj.)

also back-space, 1899, in reference to keyboarding, from back (adv.) + space.

We have had the pleasure of examining one of the 1899 model Hammond typewriters, with the new back-space key. This new feature is certainly an improvement in the machine. ["The Phonetic Journal," March 11, 1899]

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Definitions of backspace from WordNet
1
backspace (v.)
hit the backspace key on a computer or typewriter keyboard;
To erase, you must backspace
2
backspace (n.)
the typewriter key used for back spacing;
Synonyms: backspace key / backspacer
From wordnet.princeton.edu