Wordnet 3.0
VERB (1)
1. 
 change to the contrary; 
- Example: "The trend was reversed"- Example: "the tides turned against him"- Example: "public opinion turned when it was revealed that the president had an affair with a White House intern"[syn: change by reversal, turn, reverse]
WordNet (r) 3.0 (2006):
change by reversal
    v 1: 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" [syn: change by reversal, turn,
         reverse]