sing a different tune
US /sɪŋ ə ˈdɪf.rənt tuːn/
UK /sɪŋ ə ˈdɪf.rənt tuːn/

1.
mengubah pendirian, mengubah sikap
to change one's opinion or attitude, especially to one that is more agreeable or favorable, often due to a change in circumstances
:
•
After he lost his job, he started to sing a different tune about the importance of saving money.
Selepas kehilangan pekerjaannya, dia mula mengubah pendiriannya tentang kepentingan menyimpan wang.
•
The company was arrogant, but after losing a major client, they quickly started to sing a different tune.
Syarikat itu sombong, tetapi selepas kehilangan pelanggan utama, mereka cepat-cepat mula mengubah pendirian.