back·space 
/ˈbækˌspeɪs/ noun
plural back·spac·es /ˈbækˌspeɪs/ noun [count] : a key that is pressed on a typewriter or computer keyboard to move back toward the beginning of a line of text — usually singular ▪ press the backspace
— backspace verb, backspaces; backspaced; backspac·ing [no obj]
▪ He backspaced to the beginning of the line.
▪ He backspaced to the beginning of the line.
