noun

A key on a typewriter or computer keyboard used to cause the carriage or cursor to move backwards.

I’ve been digging through pictures cursing myself for not documenting my work better, typing the details from my notes then suddenly, I broke the backspace key on my computer.

verb

Move a typewriter carriage or computer cursor backwards.

The < BS > markers show where I hit the BackSpace key – note that the text I was backspacing over remains in the log.