undo

Definitions

General English

  • verb to open something which is tied or fastened

Computing

Electronics

  • A command that reverses the last action or change, such as a deletion, change in spelling, or image alteration. Most programs allow undoing multiple edits, and some allow undoing all edits of the session in progress. Also, to perform such a reversal.
http://www.dictionarycentral.com/definition/undo.html