Sing a different tune
Posted by Tim Luo on 2007/9/18 0:21:36
This means to completely change the opinions you have expressed before.
Since becoming Mayor, Harris is singing a different tune about wage cuts for politicians.
It's easy for for you to say my kids are badly behaved - you'd sing a different tune if you had to bring up a family all on your own.
Source: Longman Idioms Dictionary
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