What is the literal meaning of the Latin phrase 'ad unguem'?

The phrase 'ad unguem' literally translates to "to the fingernail" in Latin. This expression comes from a practice in ancient Rome where meticulous attention to detail was often compared to the precision of a fingernail. It signifies perfection or completeness in something, suggesting that an object or task is so finely crafted or executed that it is perfect down to the smallest detail, much like how one might keep their fingernails well-groomed.

This highlights the importance of detail in various contexts, such as art, workmanship, or even in argumentation, where getting everything right is crucial. The emphasis on the 'fingernail' serves as a metaphor for this meticulousness, making the choice the fitting interpretation of the phrase.