The phrase "shot heard round the world" refers to the first gunfire exchanged between British troops and colonial militias at the battles of Lexington and Concord on April 19, 1775.

This shot marked the beginning of the American Revolutionary War, signifying the colonists' resolve to resist British oppression. Although its precise origin remains unclear, this moment became a powerful symbol of the fight for freedom and independence. It resonated globally, inspiring other nations and movements striving for self-determination. The phrase encapsulates the significance of that initial conflict, which ultimately set the stage for a revolution against British rule.