WordReference Random House Learner's Dictionary of American English © 2015
ˈsec•ond ˈthought, n. [countable]
Often,second thoughts. [plural] an act of reconsidering a previous action, position, etc., often because of doubts as to its correctness:We had second thoughts about firing her.

Collins Concise English Dictionary © HarperCollins Publishers::

second thought n
  1. (usually plural) a revised opinion or idea on a matter already considered

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