Following are a number of back-translations as well as a sample translation for translators of Job 39:21:

• Kupsabiny: “It paws the earth violently,
  charging with all its strength into battle.” (Source: Kupsabiny Back Translation)
• Newari: “It stamps its feet on the ground and prides itself on its strength,
  and goes out to encounter people bearing weapons.” (Source: Newari Back Translation)
• Hiligaynon: “He scratches on the ground with swiftness, boasting of his strength. Then he runs going to battle.” (Source: Hiligaynon Back Translation)
• English: “They paw the ground, rejoicing about being very strong,
  as they prepare to rush into a battle.” (Source: Translation for Translators)