The spelling of the word "be duty" seems straightforward, but it can be confusing to those unfamiliar with English phonetics. The correct pronunciation of "be duty" is /bɪ ˈdjuːti/, with the emphasis on the second syllable. The "i" in "be" is pronounced as a short "ih" sound, while "duty" is pronounced as "doo-tee." To help remember the spelling, think of the word "beauty" but with a "d" sound in the middle instead of "t." So, the correct spelling is "be duty," despite its potential spelling complications.
The phrase be duty is not commonly found in the English language, and therefore does not have a specific etymology. The word duty itself, however, originates from the Old French word deu, meaning owed or owing. It subsequently evolved into devoir in Middle French before being borrowed into Middle English as duty around the 14th century. Its ultimate roots can be traced back to the Latin word debitum, which also means a debt or that which is due.