The shoulder-blade is the flat bone of the upper back. Job uses it in a curse calling for his shoulder and arm to be disabled if he had acted unjustly.
Definition
The shoulder-blade is the bone of the upper back to which the shoulder and arm are related. The biblical term occurs only in the passage describing the shoulder-blade and the adjoining arm.
Biblical Usage
In Job, the shoulder-blade appears in a curse calling for the speaker’s shoulder to fall from it and his arm to be broken if he had acted unjustly.
Historical Bible Dictionaries
International Standard Bible Encyclopedia (ISBE)
<p>shol'der-blad (shikhmah): "Then let my shoulder (kathephi) fall from the shoulder-blade (shikhmah), and mine arm (zeroa` be broken from the bone (qaneh)" (Job 31:22). The Hebrew word is the feminine form of shekhem (see SHOULDER). It is found only in this passage.</p>