Following are a number of back-translations as well as a sample translation for translators of Jeremiah 51:42:

• Kupsabiny: “Enemies will swarm to Babylon
  like an ocean that is roaring.
  (They) will destroy the Babylonians
  like when the ocean envelopes/covers the land.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Babilonia will-be-covered by the roaring waves.” (Source: Hiligaynon Back Translation)
• English: “The enemies of Babylon will cover the city like huge waves of the sea.” (Source: Translation for Translators)