The phrase "was duty to" is spelled as /wɑz ˈdjuːti tuː/. The word "was" is spelled as it sounds but the word "duty" is pronounced with a silent "u" - it is spelled as "d-u-t-y" but pronounced as /ˈdjuːti/. Finally, "to" is spelled as it sounds. This phrase is often used to describe a responsibility or obligation that someone had in the past. It highlights the importance of fulfilling one's duties and responsibilities, even if it may be challenging or inconvenient.