1. To reduce to nothing; to obliterate.
2. To make void or of no effect; to nullify; to abolish; to do away with; -- used appropriately of laws, decrees, edicts, decisions of courts, or other established rules and the like, which are made void by component authority.
3. Cancel; invalidate; destroy.

1. To declare void and nul; make ineffective.
2. To make up for; SYN. offset, set off.
3. Said of cheques or tickets: to invalidate.
4. To postpone indefinitely or annul something that was scheduled; SYN. call off.
In mathematics, to simplify a fraction or ratio by dividing both numerator and denominator by the same number (which must be a common factor of both of them). For example, 5x/25 cancels to x/5 when divided top and bottom by 5. + prikaži više

1. To declare invalid; SYN. annul, quash, void, avoid, nullify.
2. To show to be invalid; SYN. nullify.
3. To take away the legal force of or render ineffective; SYN. void, vitiate.

To make void; to render invalid; to deprive of legal force or efficacy.

ETYM as. undoen. Related to Un-, and Do to perform.
(Irregular preterit, past participle: undid, undone).
1. To cancel or reverse an action or its effect.
2. To make undone; revert to the original condition or situation.