change one's tune

Verb

change one's tune (third-person singular simple present changes one's tune, present participle changing one's tune, simple past and past participle changed one's tune)

1. (idiomatic) To reconsider; rethink; to reach a different conclusion.
   • They say my way of doing things is slower, but I think they'll change their tune as soon as they try it.
   • The heaters, the S.R. now says, will "help tremendously" if there is severe snow and ice—a welcome change of tune from last winter, when the Region was countering criticism of its operation during the January freeze-up with a bland defence of existing precautions [...].1962 December, “Talking of Trains: Point heaters on the S.R.”, in Modern Railways, page 371
2. (idiomatic) To change one's story.
   • The suspect changed his tune when he learned the police had the evidence.