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Phrase(s): throw oneself at the mercy of some authority [and] throw oneself on the mercy of some authority; throw oneself (up)on someone’s mercy
Fig. to seek mercy from a court of law, especially at one’s sentencing for a crime; to seek help from an official or institution. • He pleaded guilty and threw himself at the mercy of the court. • It did no good to throw myself on the mercy of the State Department. • Please don’t! I throw myself upon your mercy!
McGrawhill's American Idioms And Phrasal Verbs