leave somebody/something to the mercy/mercies of somebody/something

leave (one) to the mercy/mercies of (someone or something)

To allow one to face the punishment or rebukes of something or someone who will not show them any mercy, kindness, or sympathy. I thought it would be best if I spoke to her, rather than leaving her to the mercy of the principal.
See also: leave, mercy, of
Farlex Dictionary of Idioms.

leave somebody/something to the mercy/mercies of somebody/something

leave somebody/something in a situation that may cause them to suffer or to be treated badly: The soldiers had no choice but to run across open fields, which left them to the mercy of enemy gunners.
See also: leave, mercy, of, somebody, something
Farlex Partner Idioms Dictionary
See also:
  • leave (one) to the mercy/mercies of (someone or something)
  • leave to someone's tender mercies
  • leave (one) to (someone's) tender mercies
  • milk it
  • at the mercy of somebody/something
  • do (one) a kindness
  • do a kindness
  • place (oneself) at (someone's) mercy
  • harden (one's) heart against (someone or something)
  • harden your heart against somebody/something