whistle a different tune

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whistle a different tune

To change one's opinion 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!
See also: different, tune, whistle
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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References in periodicals archive ?
That's like having a person with two mouths, each one whistling a different tune.
But I am man enough to admit that I might be whistling a different tune if my daughter--or son--had been born with a face that could, proverbially, stop a truck.