Following are a number of back-translations as well as a sample translation for translators of Ezekiel 21:10:

• Kupsabiny: “That sword is sharpened for killing
  and washed until it flashes like lightning.
  There is no happiness because
  my people have refused (to listen to) what they were warned about.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “‘Man, speak my message to the people. Tell them that I, the Lord, say: I sharpened my sword for killing you (plur.). I polished it well so-that will-flash like the lightning. So/Well will- you (plur.) still -rejoice? Will- you still -mock my disciplining of you (plur.)?” (Source: Hiligaynon Back Translation)
• English: “It is sharpened in order that I can slaughtermany people with it;
  it is polished so that it will flash like lightning.
  The people of Judah will not celebratetheir being punished like this,
  but they did not repent whenI only struck them with a stick.” (Source: Translation for Translators)