backspace >> /ˈbækˌspeɪs/
Definition: [noun] A key on a typewriter or computer keyboard that causes the carriage or cursor to move backward.
Example: 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.
Definition: [noun] A device on a video recorder or camcorder which produces a slight backward run between shots to eliminate disturbance caused by the interruption of the scanning process.
Definition: [intransitive verb] Move a typewriter carriage or computer cursor back one or more spaces.
Example: The < BS > markers show where I hit the BackSpace key - note that the text I was backspacing over remains in the log.