(adversary) is to be explained either as the proper name of a country or person, as a noun in apposition, or as a verb from a root, rub, "to contend plead." All these senses are represented in the Authorized Version and the marginal readings, (Hosea 5:13; 10:6) and the east preferable has been inserted in the text. Jareb is most probably the name of some city of Assyria or another name of the country itself.
JAREB
Meaning of JAREB in English
Smith's Bible English dictionary. Английский библейский словарь Смита. 2012