Damon and Pythias is a phrase in reference to two individuals who share an unbreakable bond and loyalty towards each other. This phrase originated from an ancient Greek mythological story about two friends, Damon and Pythias, who demonstrated a remarkable sense of devotion towards each other. Synonyms for this phrase include "bosom buddies," "brothers in arms," "kindred spirits," "inseparable companions," and "close confidants." In contemporary times, the phrase "ride or die" is also used to express the same level of unwavering loyalty and commitment between two individuals who stand by each other through thick and thin.