take the rap (for someone or something)
To face punishment, blame, censure, or arrest for someone else's crime or misdeed, perhaps intentionally. We've made it look like he withdrew the money, so when the police start investigating, he'll be the one to take the rap. I'm always taking the rap for your mistakes—I'm sick of covering for you! Janet doesn't have any penalty points on her license, so she agreed to take the rap for Jeff.
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