Juggernaut means a massive force. If the army marching into your country is a juggernaut, you're doomed. If you're trying to market a new Cola product, you're up against corporate giant Coca-Cola, a beverage juggernaut if ever there was one. Juggernaut originates from Hindi Jagannath, meaning "lord of the world," and figuratively means a force or idea demanding blind devotion or ruthless sacrifice sin... While the word is still used sometimes in British English to refer to a very large, heavy truck (also called a "juggernaut lorry"), juggernaut is more commonly used figuratively for a relentless force, entity, campaign, or movement, as in "a political/economic/cultural juggernaut." Define Juggernaut. Juggernaut synonyms, Juggernaut pronunciation, Juggernaut translation, English dictionary definition of Juggernaut. n. An overwhelming or unstoppable force: "With the newly empowered juggernaut of the Pentagon bureaucracy gaining momentum, the president was no longer in...