n. 1 esp. Brit. a large heavy motor vehicle, esp. an articulated lorry. 2 a huge or overwhelming force or object. 3 (Juggernaut) an institution or notion to which persons blindly sacrifice themselves or others.
[ Hindi Jagannath f. Skr. Jagannatha = lord of the world: name of an idol of Krishna in Hindu mythol., carried in procession on a huge cart under which devotees are said to have formerly thrown themselves ]