1. [n]  a crude idol of Krishna
2. [n]  an avatar of Vishnu
3. [n]  a massive inexorable force that seems to crush everything in its way

Juggernaut
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1. \Jug"ger*naut`\, n. [Skr. jagann[=a]tha lord of the
   world.]
   One of the names under which Vishnu, in his incarnation as
   Krishna, is worshiped by the Hindoos. [Written also
   {Juggernnath}, {Jaganath}, {Jaganatha}, etc.]
   Note: The principal seat of the worship of Juggernaut is at
         P[^u]ri in Orissa. At certain times the idol is drawn
         from the temple by the multitude, on a high car with
         sixteen wheels. Formerly, fanatics sometimes threw
         themselves under the wheels to be crushed as a
         sacrifice to the god.
   

2. \Jug"ger*naut\ [Hind. Jagan-n[=a]th lord of the
   world, Skr. jagann[=a]tha.] (Hinduism)
   A particular form of Vishnu, or of Krishna, whose chief idol
   and worship are at Puri, in Orissa. The idol is considered to
   contain the bones of Krishna and to possess a soul. The
   principal festivals are the Snanayatra, when the idol is
   bathed, and the Rathayatra, when the image is drawn upon a
   car adorned with obscene paintings. Formerly it was
   erroneously supposed that devotees allowed themselves to be
   crushed beneath the wheels of this car. It is now known that
   any death within the temple of Jagannath is considered to
   render the place unclean, and any spilling of blood in the
   presence of the idol is a pollution.