Английский словарь американских идиом - change one's tune

{v. phr.}, {informal} To make a change in your story, statement, or claim; change your way of acting. * /The man said he was innocent, but when they found the stolen money in his pocket he changed his tune./ * /Bob was rude to his teacher, but she threatened to tell the principal and he changed his tune./ Syn.: SING A DIFFERENT TUNE.