undo

v. open (a jacket, package, door, etc.), release, unloose; cancel, revoke, reverse, annul; bring to ruin (emotionally, morally, etc.)

n. cancellation of an action; ability of a program to cancel the most recent action (Computers)

For Wikipedia's "undo" function, see . Undo is a command in most creative programs. It erases the last change done to the document reverting it back 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. Undo is used in many programs and is a helpful feature.
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Verb
1. cancel, annul, or reverse an action or its effect; "I wish I could undo my actions"
(hypernym) change by reversal, turn, reverse
(hyponym) untie, unbrace, unlace
(derivation) undoing
2. deprive of certain characteristics
(synonym) unmake
(hyponym) destroy, destruct
3. cause the ruin or downfall of; "A single mistake undid the President and he had to resign"
(hypernym) ruin
(derivation) destroyer, ruiner, undoer, waster, uprooter
4. cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie"
(synonym) untie, loosen
(hypernym) change, alter, modify
(derivation) undoer, opener, unfastener, untier
5. remove the outer cover or wrapping of; "Let's unwrap the gifts!"; "undo the parcel"
(synonym) unwrap
(hypernym) uncover, expose
(derivation) undoer, opener, unfastener, untier

(v. t.)
To reverse, as what has been done; to annul; to bring to naught.
  

(v. t.)
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.
  

(v. t.)
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.
  

V INTRANS
surge/flood/rise in waves; gush/well up; run| stream; billow; undulate; waver