whistle a different tune

To change one's opinon or behavior. He never used to support that political candidate, but he's whistling a different tune all of a sudden. I used to be very pessimistic, but ever since surviving that car wreck, I've been whistling a different tune!

Common Names:

Name	Pronounced	Usage
BÚI	-	Ancient Scandinavian
Chatzkel	-	Yiddish
Jos	YAWS	Dutch
Florentino	-	Spanish
Gizi	-	Hungarian
Mansoor	-	Arabic