Hippocratic ___ (doctor’s pledge)

OATH

This ancient Greek promise begins with a vow to "do no harm" and is still recited by many medical graduates today.

This clue refers to the famous "Hippocratic Oath," a historic pledge traditionally taken by doctors to uphold ethical standards in medicine. The blank hints at a four-letter word that completes the well-known phrase, and "oath" fits perfectly as the binding promise tied to Hippocrates, the ancient Greek physician. It’s a straightforward definition with no wordplay—just a nod to medical culture and history.