What is "undo"

Undo \Un*do"\, v. t. [AS. und?n. See 1st Un-, and Do to perform.]

1. To reverse, as what has been done; to annul; to bring to naught.

   What's done can not be undone.
   --Shak.

   To-morrow, ere the setting sun, She 'd all undo that she had done.
   --Swift.

2. To loose; to open; to take to piece; to unfasten; to untie; hence, to unravel; to solve; as, to undo a knot; to undo a puzzling question; to undo a riddle.
   --Tennyson.

   Pray you, undo this button.
   --Shak.

   She took the spindle, and undoing the thread gradually, measured it.
   --Sir W. Scott.

3. To bring to poverty; to impoverish; to ruin, as in reputation, morals, hopes, or the like; as, many are undone by unavoidable losses, but more undo themselves by vices and dissipation, or by indolence.

   That quaffing and drinking will undo you,
   --Shak.

Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position; to cancel, discharge, abrogate, reverse what has been done, put back in a former condition; bring to ruin, destroy," from un- (2) "opposite of" + do (v.). Related: Undone; undoing.

Etymology 1 vb. To reverse the effects of an action.(jump reverse effects a s) Etymology 2

1. (misspelling of undue English)

1. v. cancel, annul, or reverse an action or its effect; "I wish I could undo my actions"

2. deprive of certain characteristics [syn: unmake] [ant: do]

3. cause the ruin or downfall of; "A single mistake undid the President and he had to resign"

4. cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie" [syn: untie, loosen]

5. remove the outer cover or wrapping of; "Let's unwrap the gifts!"; "undo the parcel" [syn: unwrap] [ant: wrap]

6. [also: undone, undid]

Undo is a command in many computer programs. It erases the last change done to the document reverting it to an older state. In some more advanced programs such as graphic processing, undo will negate the last command done to the file being edited.

The opposite of undo is redo. The redo command reverses the undo or advances the buffer to a more current state.

In most Windows applications, the Undo command is activated by pressing the Ctrl+Z or Alt+Backspace keybindings. In all Macintosh applications, the Undo command is activated by pressing Command-Z. The common command for Redo on Microsoft Windows systems is Ctrl+Y or Ctrl+ Shift+Z. The common command for Redo on Apple Macintosh systems is Command- Shift-Z.

"Undo" is the first record single from contemporary Christian band Rush of Fools. It was released in 2007 from the band's first album Rush of Fools. It was the most played song of the year in 2007 on Christian adult contemporary radio.

This song was also by the compilation album WOW Hits 2008.

Undo is a command in many computer programs.

Undo or UNDO may also refer to:

"Undo" is a song by Swedish singer Sanna Nielsen. The track was written and composed by Fredrik Kempe, David Kreuger, Hamed "K-One" Pirouzpanah. It premiered on 8 February 2014, as part of the second semi-final in Melodifestivalen 2014. The song successfully progressed to the final. The single was officially released on 23 February 2014, part of the EP of the same title. Undo is an uptempo ballad.

On 8 March, the song won the Melodifestivalen 2014 final beating Ace Wilder's " Busy Doin' Nothin'" by only two points and represented Sweden in the Eurovision Song Contest 2014 in the first semifinal on 6 May.

In the final, on 10 May 2014, after the results came through, "Undo" finished the contest in 3rd place with 218 points. With this score, "Undo" became the second highest scoring Swedish entry at Eurovision after Euphoria.

"Undo" won the OGAE vote with 354 winning the voting after all countries had voted.