Throw yourself on somebody’s mercy
Definition 1 of 1
Pro Tip 1/3Desperation
Used when someone has no other options and is in a desperate situation. 
With no allies left, the captured spy threw himself on the enemy's mercy.
Pro Tip 2/3Power Dynamic
Shows a power imbalance where one person is completely at the mercy of another. 
The tenant threw herself on the landlord's mercy when she couldn't pay the rent.
Pro Tip 3/3Not Literal
It's a figurative expression and doesn't involve physical action. 
Failing the final exam, Joe threw himself on the professor's mercy for extra credit.