This idiom stems from 19th-century battlefield medicine, where soldiers were given a lead bullet to clench in their teeth during surgery without anesthesia. During the American Civil War and British colonial conflicts, the absence of ether forced wounded men to endure excruciating procedures. Clenching the soft lead prevented them from screaming or injuring themselves. It has since transitioned into a professional metaphor for facing a difficult but necessary task with stoicism.
Tags: Resilience, Military History, Decision Making