A juggernaut is something (such as a force, campaign, or movement) that is extremely large and powerful and cannot be stopped.

// The team is a juggernaut this year, winning more games than any team before it has.

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"[Judd] Apatow talked about the box office success of 'Wicked,' the Universal musical that became a juggernaut over the holiday season and has been an awards darling ..." — Cynthia Littleton, Variety, 8 Feb. 2025

In the early 14th century, Franciscan missionary Friar Odoric brought to Europe the story of an enormous carriage that carried an image of the Hindu god Vishnu (whose title was Jagannāth, literally, "lord of the world") through the streets of India in religious processions. Odoric reported that some worshippers deliberately allowed themselves to be crushed beneath the vehicle's wheels as a sacrifice to Vishnu. That story was likely an exaggeration or misinterpretation of actual events, but it spread throughout Europe. The tale caught the imagination of English listeners, and they began using juggernaut to refer to any massive vehicle (such as a steam locomotive) and to any other enormous entity with powerful crushing capabilities. 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."