Hi,
Is that true that "on second thought" is common in North America whereas "on second thoughts" is more often heard in GB (and other BE speaking countries)?
(That's what my e-Longman dictionary claims...)
In BrE it is "on second thought s ". Google Ngrams bears out that "on second thought" is the more common form in the US.
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In BrE it is "on second thoughts".
Google Ngrams bears out that "on second thought" is the more common form in the US.