undo

Meanings

1. 1
   verb

   To cancel or reverse something that has been done.

   I wish I could undo what I said to her.

2. 2
   verb

   To open or unfasten something that is tied, buttoned, or zipped.

   Could you undo my buckle for me?

3. 3
   noun

   An action that reverses your last step, especially on a computer.

   How many undos does this program support?

From Middle English undōn, from Old English ondōn, from Proto-West Germanic *andadōn (“to undo”), equivalent to un- + do. Cognate with West Frisian ûndwaan, ûntdwaan (“to undo; rid”), Dutch ontdoen (“to undo”).

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