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.
References in periodicals archive ?
This is how Derrida rewrites Kant's transcendental deduction, undoes Heidegger's Zusage, and detheologizes Levinas.
The pounds 35 bra, which goes on sale in the autumn, fastens with a gold magnet and undoes with a twist.
The undo command simply undoes the last command entered--a very useful tool.