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

1.
mengubah pandangan, 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.
Setelah kehilangan pekerjaannya, dia mulai mengubah pandangannya tentang pentingnya menabung.
•
The company was arrogant, but after losing a major client, they quickly started to sing a different tune.
Perusahaan itu sombong, tetapi setelah kehilangan klien besar, mereka dengan cepat mulai mengubah sikap.