transitive verb. 1 : to open or loose by releasing a fastening. 2 : to make of no effect or as if not done : make null : reverse. 3a : to ruin the worldly means, reputation, or hopes of a politician undone by scandal.

What is the mean by undo?

transitive verb. 1 : to open or loose by releasing a fastening. 2 : to make of no effect or as if not done : make null : reverse. 3a : to ruin the worldly means, reputation, or hopes of a politician undone by scandal.

What is the undo and Redo?

The undo function is used to reverse a mistake, such as deleting the wrong word in a sentence. The redo function restores any actions that were previously undone using an undo. … For example, if you typed a word, and then deleted it using an undo, the redo function restores the word you deleted (“undid”).