backspace

Concise Oxford English Dictionary © 2008 Oxford University Press:
backspace/ˈbakspeɪs/

▶noun

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

• 2 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.

▶verb move a typewriter carriage or computer cursor backwards.