be at the mercy of (something)

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be at the mercy of (something)

To be subject to the control of a particular person or thing. When you're a minor, you're at the mercy of your parents completely. When you travel by public transportation, you're at the mercy of the weather. Her fate is at the mercy of the jury—it's their decision now.
See also: mercy, of
References in periodicals archive ?
Despite the promises of the secession leaders to push for it, it is a done deal that until a new ordinance is passed, the renters in the Valley will be at the mercy of the landlords.
I would like to be low; it would be at the mercy of some other facility,'' Sinclair said.