Following are a number of back-translations as well as a sample translation for translators of Proverbs 16:30:

• Kupsabiny: “A person who winks his eyes plans evil,
  and when he compresses his mouth/lips he is planning evil.” (Source: Kupsabiny Back Translation)
• Newari: “Those who wink with the eye
  are planning something evil,
  and those who purse their lips
  have dark hearts.” (Source: Newari Back Translation)
• Hiligaynon: “[You (plur.)] be-careful with the people who smile and wink for they might have an evil plan.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The person who stares-fixedly-at (you) or watches- you (sing.) -surreptitiously, he has an evil purpose/motive.” (Source: Kankanaey Back Translation)
• English: “People sometimes show with one of their eyes to signal to their friends that they are planning to do something to harm others;
  they smirk when they are about to do something evil.” (Source: Translation for Translators)