rollback

Short definition from Wiktionary

Noun

1. 1
   A return to a prior state by undoing some operation, especially of policy or price changes.
2. 2
   A withdrawal of military forces.
3. 3
   An operation which returns a database, or group of records in a database, to a previous state (normally to the previous commit point).
4. 4
   The situation where a rollercoaster fails to reach the top of a hill and instead rolls backward.
5. 5
   A form of flatbed truck adapted or designed specifically as a tow truck or for transporting other vehicles.
6. 6
   The strategy of forcing a change in the major policies of a state, usually by replacing its ruling regime, or by totally annihilating an enemy's armed forces and occupying the country, as was done in World War II to Italy, Germany, and Japan.
7. 7
   An uncommanded reduction in the thrust of a jet engine.

Verb

1. 1
   To return to the previous state.
2. 2
   To reduce thrust without having been commanded to do so.