Following are a number of back-translations as well as a sample translation for translators of Isaiah 51:23:

• Kupsabiny: “I shall send this trouble to those people who oppress you
  those who tell you to lie down so they can walk on you,
  to trample on your backs like one tramples on a road.’” (Source: Kupsabiny Back Translation)
• Newari: “I will give that cup to their hands who oppress you.
  who said to you like this, ‘Lay down, that we may take your body and walk over you.’
  And you made your back like the ground
  and like a path to be walked over.’” (Source: Newari Back Translation)
• Hiligaynon: “I will-give this to the ones-who-cause- you (plur.) -to-suffer, who commanded you (plur.) to-fell-facedown so-that they will-walk on you (plur.). They walked/trampled your (plur.) backs as-if they pass on the road.’” (Source: Hiligaynon Back Translation)