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English definition of “second thought”

second thought

noun [C]    
without a second thought If you do something without a second thought, you do it without first considering if you should do it or not: She'll spend a hundred pounds on a dress without a second thought.Doing things without fear or proper thought have second thoughts to change your opinion about something or start to doubt it: You're not having second thoughts about getting married, are you?Changing your mind on second thoughts UK (US on second thought) used when you want to change a decision you have made: I'd like a cup of coffee, please - actually, on second thoughts, I'll have a beer.Changing your mind
(Definition of second thought noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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