backspace

[bak-speys]
verb (used without object), backspaced, backspacing.
1.
to shift the carriage or typing element of a typewriter one space backward by depressing a special key.
2.
Computers. to move the cursor, printhead, etc., toward the beginning of the data.
noun
3.
the space made by backspacing.
4.
Also called backspacer, backspace key. the labeled key on a typewriter or computer keyboard used for backspacing.

Origin:
back2 + space

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
backspace (ˈbækˌspeɪs)
 
vb
1.  to move a (typewriter carriage) backwards
 
n
2.  a typewriter key that effects such a movement

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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FOLDOC
Computing Dictionary

backspace definition

character
(BS) ASCII code 8, Control-H. The control character that should cause most output devices to move their current output position back to the previous character so that the next character output will replace (or overprint) it. Inputting a backspace (typically by pressing the backspace key) causes many systems to delete the character before the input cursor, though others use delete for this.
See twirling baton for an imaginitive use of backspace.
(2003-10-25)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
He almost never uses the backspace, delete, or cut-and-paste keys.
The backspace key is woefully undersized, and for some reason it did not always
  work properly when held down.
While you master it, you will probably be glad for the oversized backspace key.
Learn to correct mistakes without staring at the backspace key.
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