Juggernaut
Etymology
From Jagannath, from Sanskrit Jagannātha (“lord of the world,” from jagat, “world,” plus nātha, “lord”), a form of Vishnu worshipped at Puri in eastern India. During the annual chariot festival a colossal cart carries the deity, and European travelers spread lurid — and largely exaggerated — tales of devotees crushed beneath its wheels. From those accounts English drew “an unstoppable, crushing force.”
noun · /JUG-er-nawt/
A massive, unstoppable force that crushes whatever stands in its way.
What it names
The overwhelming, self-propelled momentum of a thing too big to halt — a company, a movement, a machine grinding forward.
Example
The streaming service became a juggernaut, swallowing studios and rivals alike.
Related idea
A behemoth is merely huge; a juggernaut is huge and in motion, flattening whatever lies in its path.