Source : WordNet®

rethink
     n : thinking again about a choice previously made; "he had
         second thoughts about his purchase" [syn: {reconsideration},
          {second thought}, {afterthought}]
     v : change one's mind; "He rethought his decision to take a
         vacation"
     [also: {rethought}]

rethought
     See {rethink}