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change tune
change someone's tune
to change the manner of a person, usually from bad to good, or from rude to pleasant. The teller was most unpleasant until she learned that I'm a bank director. Then she changed her tune. "I will help change your tune by fining you $150," said the judge to the rude defendant.
change your tune
to change your opinion completely They'll change their tune when they see that their advice is making people angry with them.
change your tune
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 I told him how much money he'd get out of it.
change (one's) tune
To alter one's approach or attitude.