Real Dictionary

juggernaut
countable noun: A juggernaut is a very large truck.

Juggernaut in British English
an incarnation of the Hindu god Vishnu, whose idol, it was formerly supposed, so excited his worshipers when it was hauled along on a large car during religious rites that they threw themselves under the wheels and were crushed
noun: a crude idol of Krishna worshipped at Puri and throughout Odisha (formerly Orissa) and Bengal. At an annual festival the idol is wheeled through the town on a gigantic chariot and devotees are supposed to have formerly thrown themselves under the wheels
noun: any large, overpowering, destructive force or object, as war, a giant battleship, or a powerful football team
noun: any terrible force, esp one that destroys or that demands complete self-sacrifice