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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
at someone's mercy
Grammar usage guide and real-world examplesAlternative expressions(20)
at the mercy of
vulnerable to
subject to the whims of
under the control of
defenseless against
at the disposal of
susceptible to
exposed to
dependent on
at your service
at the service of
readily available to
accessible to
subject to
in the hands of
to be used by
intended for use by
designed for use by
for the use of
for the benefit of
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
While it's unusual and a little unnerving (purposefully so) to see our heroine at someone's mercy and truly unable to gain the upper hand, that inherent wrongness only served to highlight how thoroughly Nikita has lost control -- of both Division and her personal relationships.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
59 human-written examples
It places Ms. Lovato somewhere unusual: at someone else's mercy — "Strong enough to leave you, but weak enough to need you".
News & Media
Not that long ago I got sick and tired of being at someone else's mercy, so I broke away from the herd.
News & Media
Chelsea is at Mourinho's mercy.
News & Media
We are at Washington's mercy.
News & Media
As it stands, we're at Adobe's mercy here.
News & Media
Before yelling at someone.
News & Media
Yell at someone.
Wiki
Stare at someone.
Wiki
Stare at someone intently.
Wiki
Then, in September , 2002 a fax arrived from someone calling herself Mercy Nduka, who claimed to be a confidential secretary at the Central Bank of Nigeria.
News & Media
Expert writing Tips
Best practice
The phrase works best in narratives where there is a clear power imbalance, such as in legal, political or high-stakes interpersonal contexts.
Common error
Do not assume that being "at someone's mercy" implies that the person in power will be kind. The idiom refers to the state of being under their control, regardless of whether they choose to exercise leniency or severity.
Source & Trust
89%
Authority and reliability
4.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "at someone's mercy" functions as a complex prepositional phrase that acts adjectivally or adverbially. It describes the state or condition of a subject in relation to an external authority. In the examples provided by Ludwig, it often modifies the subject's status, indicating a loss of agency or autonomy.
Frequent in
News & Media
75%
Academia
12%
Formal & Business
8%
Less common in
Wiki
3%
Science
1%
Reference
1%
Ludwig's WRAP-UP
The phrase "at someone's mercy" is a powerful idiomatic tool used to describe situations of total dependence and subjection. According to Ludwig AI data, it is a staple of high-quality journalism and academic discourse, appearing in outlets like The New Yorker and The New York Times. While the exact phrase count for the possessive form "someone's" may appear rare compared to the generic "at the mercy of", its usage remains grammatically impeccable and rhetorically effective. Writers should use it to emphasize a lack of agency, noting that the "mercy" in question refers to the power of the controller rather than their temperament. It effectively conveys the stakes in political, corporate and personal conflicts where one party holds all the cards.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
in the power of
Directly emphasizes the authority or control held by the other party
subject to the whims of
Highlights the unpredictable or arbitrary nature of the control
powerless before
Shifts the focus to the total inability of the subject to resist
under the control of
A more literal and less idiomatic description of the situation
vulnerable to
Focuses on the potential for harm rather than the exercise of power
defenseless against
Emphasizes the lack of protection or safeguards
at the disposal of
Implies being available for use or command by another
susceptible to
Often used in clinical or technical contexts to denote weakness
exposed to
Indicates a lack of shielding from external influence
dependent on
Describes a relationship of necessity rather than just subjection
FAQs
How do I use "at someone's mercy" in a sentence?
You can use it to describe vulnerability, such as: "The small company was "at the mercy of" the larger corporation's pricing decisions."
What is the difference between "at someone's mercy" and "vulnerable to"?
While both imply weakness, "at someone's mercy" specifically denotes being under the direct power or control of another person, whereas "vulnerable to" can refer to general risks or environmental factors.
Can I say "at the mercy of someone" instead?
Yes, both versions are correct. Using "someone's mercy" is a possessive construction, while "at the mercy of" uses a prepositional structure; they are semantically identical.
Is "at someone's mercy" formal or informal?
It is generally considered neutral to formal. It appears frequently in prestigious publications like The New York Times and The Guardian, making it suitable for professional and academic writing.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
89%
Authority and reliability
4.8/5
Expert rating
Real-world application tested