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

1.
cantar uma melodia diferente, mudar de opinião
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.
Depois de perder o emprego, ele começou a cantar uma melodia diferente sobre a importância de economizar dinheiro.
•
The company was arrogant, but after losing a major client, they quickly started to sing a different tune.
A empresa era arrogante, mas depois de perder um cliente importante, eles rapidamente começaram a cantar uma melodia diferente.