have (someone) at (one's) mercy

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have (someone) at (one's) mercy

To have someone under the control of or dictated by the actions of someone else, without the ability to defend or liberate oneself. Please don't report me to the headmaster. You have me at your mercy! Once the gangsters were able to blackmail Susan, they had her at their mercy.
See also: have, mercy

have somebody at your ˈmercy

have somebody completely in your power or under your control: I’ve got you at my mercy now. What shall I do with you?
See also: have, mercy, somebody