at someone's or something's mercy
idiom
: in a position or situation in which one can be harmed by (someone or something one cannot control)
The army advanced, and the people were at their mercy.
Cite this Entry
“At someone's or something's mercy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/at%20someone%27s%20or%20something%27s%20mercy. Accessed 29 Nov. 2025.
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