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.

WordReference Random House Unabridged Dictionary of American English © 2015
second thought, 
  • Often,second thoughts. reservation about a previous action, position, decision, judgment, or the like:He had second thoughts about his decision.
  • on second thought, after reconsideration:On second thought, I don't think I'll go.
  • Also,second-thought. 
    Etymology:1625–35


    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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