on second thoughts
On reconsideration
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Main Entry: ↑thought
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on second thoughts mainly spoken phrase
used when you want to change something that you have just said, often to say the opposite
We don’t need an umbrella. On second thoughts, maybe we do.
Thesaurus: change of opinionsynonym
Main entry: second
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on ˈsecond thoughts idiom
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I'll wait here. No, on second thoughts, I'll come with you.
Useful english dictionary. 2012.