undo

To open something that holds clothes or other things together.

• Please undo your belt.
• She undid the buttons on her coat.
• I could not undo the knot in my shoelaces.

Similar words: unfasten, untie

Opposites: fasten

Common phrases: undo a button, undo a knot, undo a belt

To remove the effects of something that has been done.

• We cannot undo the damage.
• One careless decision undid years of progress.
• Can anything undo the harm this caused?

Similar words: reverse, cancel out

Common phrases: undo the damage, undo a mistake, undo someone’s work

To return a computer file or program to how it was before your last change.

• You can undo that edit.
• I accidentally deleted a paragraph, then undid the change.
• Press these keys to undo your last action.

Similar words: revert

Opposites: redo

Common phrases: undo an edit, undo a change, undo the deletion

A computer command or action that removes the last change you made.

• Click the undo button.
• The editor allows several undos in a row.
• An undo restored the text I had deleted.

Opposites: redo

Common phrases: undo button, undo command, undo function