What is the meaning of Undo?

To reverse the effects of an action.

To unfasten.

To impoverish or ruin, as in reputation; to cause the downfall of.

An operation that reverses a previous action.

Misspelling of undue.

to rise in waves

to overflow with, abound in

to wave, undulate

flattery

inflection of undōn:

1. first-person singular present indicative
2. singular present subjunctive
3. singular imperative

first-person singular present indicative

singular present subjunctive

singular imperative

Source: wiktionary.org