Sam Bray (translator, alongside of John F. Hobbins, of Genesis 1–11: A New Old Translation for Readers, Scholars, and Translators, which "follows the Hebrew text closely and leaves in what many translations leave out: physicality, ambiguity, repetition, even puns") explains some of his translation theory:
“Double translation” means rendering one term in the original with two terms in the translation. This technique is almost never used in contemporary English Bible translations, but there is precedent for it. Ancient Greek translators of Genesis used double translations (e.g., the Septuagint’s “chest and belly” in Genesis 3:14, and Theodotion’s “in the wind during the cooling off of the day” in Genesis 3:8). Medieval English translators used double translations. And some gifted 20th century writers used them, such as Hannah Arendt, when translating a word from Aristotle into German, and Langston Hughes, when translating an African political slogan into English.
Why double translation? Our translation is meant to be very close, closer than the widely used English translations of Genesis, both Jewish and Christian (e.g., NJPS, NRSV, Alter, NIV, ESV). So we don’t use double translation to gild the lily. Rather, the idea is that languages don’t fully align. An expression may have multiple senses or shades of meaning that can’t be carried over into the receiving language with a single translation. In these cases, a translator can try to capture more of the significance with a double translation, at the cost, however, of giving up the concision of the original.