Take the fall for someone American informal
To accept the punishment or blame for something another person did
She had broken the vase, and I would not take the fall for her.
Tina has high self-esteem, so she never lets anyone take the fall for her.
My brother took the fall for my mistake because he didn't want me to be punished.
The verb "take" should be conjugated according to its tense.
Although the word “fall” originated in Old English, the origin of the idiom “take the fall” or “take a fall” meaning one incurs the blame for a misdeed perpetrated by another originated in the 1920s. At first, it was used only in criminal underworld slang; by the middle of the 1900s, the idiom was extended to less criminal types of blame.