Meaning of “change your tune” in the English Dictionary

british dictionary

"change your tune" in British English

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change your tune

disapproving

to change your opinion completely, especially because you know it will bring you an advantage:

He was against the idea to start with, but he soon changed his tune when he realized how much money he'd get.

(Definition of “change your tune” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)