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The phrase "a sole duty" is correct and usable in written English.
It can be used to emphasize that a particular responsibility or obligation is the only one assigned to someone or something.
Example: "As the project manager, my sole duty is to ensure that the team meets the deadlines."
Alternatives: "an exclusive responsibility" or "a singular obligation."
Exact(1)
"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.
Similar(59)
In the end, they taught the people about rights rather than obligations, thus establishing the myth that Venezuela is a rich country, and that the sole duty of a good government is to distribute its wealth evenly.
The Grantham daughters (above), born into a society where their sole duty was ornamental, all stepped out of that boring box.
First, the comptroller's office should have a board of directors whose sole duty would be to protect and increase state pension assets, and it would have to approve the awarding of investment contracts.
Finally, an employee was assigned the sole duty of spotting empty seats so they could be filled quickly.
One step they can take is to appoint a high-level peace envoy whose sole duty is to monitor and encourage, diplomatically and financially, the Israeli-Palestinian peace process.
Her sole duty is to provide the Dauphin with a male heir, a task made more urgent when he ascends the throne, his rambunctious old goat of a father (Rip Torn) having died from smallpox.
Lt. Col. David W. Morrison, the division intelligence officer, for example, has detailed 10 soldiers to an intensive course in Pashto, the major language in Afghanistan, as their sole duty for 47 weeks.
That was my sole duty.
The sole duty of every member of Parliament is to do what he or she thinks is right," Bercow said.
"An executor's sole duty is to carry out the provisions of the will," said Bruce Stone, a lawyer in Miami who specializes in estates.
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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