S: (v) undo (cancel, annul, or reverse an action or its effect) "I wish I could undo my actions"
S: (v) change by reversal, turn, reverse (change to the contrary) "The trend was reversed"; "the tides turned against him"; "public opinion turned when it was revealed that the president had an affair with a White House intern"
S: (v) change (undergo a change; become different in essence; losing one's or its original nature) "She changed completely as she grew older"; "The weather changed last night"