undo

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undo

To restore the last editing operation that has taken place. For example, if a segment of text has been deleted or changed, performing an undo will restore the original text. Programs may have several levels of undo, including being able to reconstruct the original data for all edits performed in the current session. See redo and undo send.

Control-Z
On many operating systems and applications, pressing Ctrl-Z on the keyboard undoes the last function. See Control key.
References in periodicals archive ?
Lee Upton; UNDID IN THE LAND OF UNDONE; New Issues Poetry & Prose $14.
Cameron, who was 12 at the time, undid his seatbelt and swam to the surface, where he discovered he was the first to escape.
The woman said Dr Carlos Michael Azurdia, 65, undid her front-opening bra and touched her ``in a sexual way''.