Open English Wordnet
Nouns
(n)reversal, turn aroundturning in an opposite direction or position“the reversal of the image in the lens”
(n)reversal, change of mind, flip-flop, turnabout, turnarounda decision to reverse an earlier decision
(n)about-face, volte-face, reversal, policy changea major change in attitude or principle or point of view“an about-face on foreign policy”