throw (oneself) upon the mercy of (someone)

throw (oneself) upon the mercy of (someone)

To plead with someone, especially a figure of authority, to show one lenience and mercy. I have no excuse for what I did. I can only throw myself on the mercy of the duke and beg for his forgiveness. She threw herself at the mercy of the court, saying that her dependence on drugs led her to commit those crimes.
See also: mercy, of, throw, upon
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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