Meaning of “(how much) do you want to bet?” in the English Dictionary

british dictionary

"(how much) do you want to bet?" in British English

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(how much) do you want to bet?

informal

said in answer to something that someone has said, meaning that you are certain that they are wrong:

"Surely she won't be late this time." "How much do you want to bet?"

(Definition of “(how much) do you want to bet?” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)