The meaning of Cushan in the Bible
(From Easton's Bible Dictionary)

probably a poetic or prolonged name of the land of Cush, the Arabian Cush (Habakkuk 3:7). Some have, however, supposed this to be the same as Chushan-rishathaim (Judges 3:8,10), i.e., taking the latter part of the name as a title or local appellation, Chushan "of the two iniquities" (= oppressing Israel, and provoking them to idolatry), a Mesopotamian king, identified by Rawlinson with Asshur-ris-ilim (the father of Tiglathpileser I.); but incorrectly, for the empire of Assyria was not yet founded. He held Israel in bondage for eight years.

See more on the meaning of Cushan in the Bible:
Cushan {International Standard Bible Encyclopedia}

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