Following are a number of back-translations as well as a sample translation for translators of Proverbs 20:20:

• Kupsabiny: “If a person goes as far as abusing his father or mother,
  (he) goes like that and will never lit a fire (have no children).” (Source: Kupsabiny Back Translation)
• Newari: “Whoever curses his father or mother,
  his life will be like a lamp
  which has gone out while it was dark.” (Source: Newari Back Translation)
• Hiligaynon: “A child who curses his parents will-die like a lamp which snuffed-out/[lit. died] in darkness.” (Source: Hiligaynon Back Translation)
• Kankanaey: “If someone curses his father or his mother, his life will be earlied (i.e., he will die early) like a light that is suddenly extinguished in the middle of the night.” (Source: Kankanaey Back Translation)
• English: “If someone curses his father or his mother,
  his life will be ended, just like a lamp is extinguished.” (Source: Translation for Translators)