Simple past tense and past participle of backspace.(verb)
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Use "backspaced" in a sentence
"The typewriters supported correction ribbons, but except in a few rare circumstances, they weren't installed so that it was incredibly obvious if you backspaced and typed over yourself."
"And then my fingers retracted their message, backspaced, deleted, and I resumed my pacing, my worrying."
"Could Twain have backspaced and changed his dialogue?"