Strong's Concordance

Original word: νῶτος
Transliteration: nótos
Definition (short): backs
Definition (full): the back

NAS Exhaustive Concordance

Word Origin: of uncertain origin
Definition: the back
NASB Translation: backs (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Of uncertain affinity; the back -- back.
KJV: Let their eyes be darkened, that they may not see, and bow down their back alway.
NASB: "LET THEIR EYES BE DARKENED TO SEE NOT, AND BEND THEIR BACKS FOREVER."