at someone's or something's mercy

idiom

Definition of at someone's or something's mercy

: 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.

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“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 27 Oct. 2020.

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