From arab (in the sense of exchange); a pawn (given as security) -- pledge.
see HEBREW arab
H6162. erabon
עֵרָבוֺן noun [masculine] pledge; — ע ׳נָתַן give a pledge Genesis 38:17-18, ע ׳לָקַח 38:20 (all J), receive (back) a pledge (when condition is fulfilled). — Job 17:3 read perhaps עֶרְבֹנִי (for עָרְבֵנִי ᵑ0), as object of שֹׂימָה set my pledge (a surety for me), so Beer Bu and others