WordReference Random House Learner's Dictionary of American English © 2017
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 © 2017
    second thought, 
    1. Often,  second thoughts. reservation about a previous action, position, decision, judgment, or the like:He had second thoughts about his decision.
    2. on second thought, after reconsideration:On second thought, I don't think I'll go.
    Also,  second-thought. 
    • 1625–35

    Collins Concise English Dictionary © HarperCollins Publishers::

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

    'second thought' also found in these entries:

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