Used and loved by millions
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
sole duty
Grammar usage guide and real-world examplesUSAGE SUMMARY
"sole duty" is correct and usable in written English.
You can use it when referring to a singular responsibility, task, or obligation. Example: His sole duty was to ensure the safety of the passengers.
✓ Grammatically correct
News & Media
Academia
Wiki
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
22 human-written examples
That was my sole duty.
News & Media
Finally, an employee was assigned the sole duty of spotting empty seats so they could be filled quickly.
News & Media
The sole duty of every member of Parliament is to do what he or she thinks is right," Bercow said.
News & Media
Its sole duty is to monitor and, if necessary, reduce Medicare spending, which needs to be reined in to control deficits.
News & Media
"It would be completely impractical if you had robots with a sole duty to rescue soldiers, because they would spend most of their time unused," he says.
News & Media
The sole duty of every Member of Parliament is to do what he or she thinks is right". May was not there.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
38 human-written examples
Additionally, it is often the sole responsibility of the driver(s) on duty to remember on the go which customers have radioed requesting pickups, while simultaneously completing pickups already on their route.
Wiki
I didn't ponder whether shareholder wealth should be the sole fiduciary duty of top management.
News & Media
Perhaps this is my life's, my writing's sole, true duty: to delineate the course of this disintegration".
News & Media
But the bill does not once refer to equity and the sole public duty of a foundation trust is to exercise its func tions "efficiently, effectively and economically".
News & Media
They decided the aggregates levy (a £2-a-tonne tax on quarrying) stamp duty, air passenger duty and landfill tax should all be devolved, and the Welsh government should have sole responsibility for business rates.
News & Media
Expert writing Tips
Best practice
Use "sole duty" to clearly define a person's or entity's singular responsibility, avoiding ambiguity about who is accountable.
Common error
Avoid using "sole duty" when multiple parties share the responsibility. If the duty is distributed, use phrases like "primary duty" or "shared responsibility" instead.
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "sole duty" functions primarily as a noun phrase, typically serving as a subject complement or an object of a preposition. It identifies and emphasizes a singular, exclusive responsibility. This is supported by Ludwig's examples, which demonstrate its use in defining roles and obligations.
Frequent in
News & Media
44%
Academia
16%
Wiki
8%
Less common in
Science
12%
Formal & Business
8%
Encyclopedias
4%
Ludwig's WRAP-UP
In summary, "sole duty" is a grammatically sound and commonly used phrase to denote a singular, exclusive responsibility. Ludwig AI confirms its correct usage. It is most frequently found in News & Media and Academic contexts. When using this phrase, ensure that the responsibility truly belongs to one entity alone, and that no ambiguity exists. Consider alternatives like "exclusive responsibility" or "only obligation" for nuanced emphasis. This phrase helps to clearly establish accountability in various settings.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
single duty
Highlights that this is the only duty that one has.
exclusive responsibility
Emphasizes that the duty belongs to one person or entity alone.
only obligation
Highlights that there are no other duties besides the one specified.
singular task
Focuses on the duty as a specific, individual task.
prime responsibility
Indicates the duty is the most important or significant one.
main obligation
Stresses the duty is the principal or chief one.
chief responsibility
Implies the duty is the leading or governing one.
fundamental obligation
Emphasizes the basic and essential nature of the duty.
core responsibility
Suggests the duty is at the very heart of someone's role.
exclusive task
Highlights the duty as the only specific task that belongs to one person or entity.
FAQs
How can I effectively use "sole duty" in a sentence?
Use "sole duty" to emphasize that a specific responsibility belongs exclusively to one person or entity. For example, "The CEO's "prime responsibility" is to ensure the company's financial stability."
What are some alternatives to "sole duty"?
You can use alternatives like "exclusive responsibility", "only obligation", or "chief responsibility" depending on the specific context.
Is it correct to say "the sole duties" instead of "sole duty"?
No, "the sole duties" implies multiple duties, which contradicts the meaning of "sole." Use "sole duty" when referring to a single, exclusive responsibility. If there are multiple exclusive duties, rephrase for clarity, such as "each employee's "unique duty"".
What's the difference between "sole duty" and "primary duty"?
"Sole duty" indicates an exclusive responsibility, while "primary duty" suggests the most important duty among others. The "main obligation" might be one of several, but the "sole duty" is the only one assigned.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.5/5
Expert rating
Real-world application tested