To officially cancel or annul something, such as a law, license, or agreement. The government decided to revoke the company's operating license due to multiple violations.
To take back or withdraw a promise, offer, or privilege. He decided to revoke his earlier promise to help with the project.
In a trick-taking card game, to fail to follow suit when able and required to do so, thus breaching the rules. The declarer was penalised after he inadvertently revoked on the third trick.