You must remember that your sole duty is to be loyal to the Compagnie.

Crawford insisted that preaching was the sole duty of the missionary.

Later, during the dinner portion of the evening, their sole duty would be making sure the guests' water glasses remained full.

I understand you have a group of police officers whose sole duty it is to search for men who are missing.

There are also 15 officers and a sergeant whose sole duty it is to be on hand when the Broadway theaters let out each night.

Some regions have an employee known as a "forager", whose sole duty is to source local products for each store.

In fact, almost his sole duty will be to make war!

Their sole duty is to wait for an alarm.

The trustees were never a government; their sole duties had to do with relations between the Families and the rest of that society.

What about the violation that is "the sole duty" of the tenant to correct?