second thought Definition in the Cambridge English Dictionary
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Definition of “second thought” - English Dictionary

Definition of "second thought" - American English Dictionary

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second thoughtnoun [C]

 us   /ˈsek·ənd ˈθɔt, ˌθɔt/
a ​change in a ​decision or ​opinion: He ​apparently had second thoughts about that ​remark. On second thought (= after ​thinking about it ​further), I would like a ​glass of ​water.
(Definition of second thought from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "second thought" - British English Dictionary

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second thoughtnoun [C]

uk   us  
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 ​dollars on a ​dress without a second ​thought.have second thoughts to ​changeyouropinion about something or ​start to ​doubt it: You're not having second ​thoughts about getting ​married, are you?on second thoughts UK (US on second thought) used when you ​want to ​change a ​decision you have made: Can I have a ​cup of ​coffee, ​please? - ​actually, on second ​thoughts, I'll have a ​beer.
(Definition of second thought from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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