zḥl - to be afraid/to withdraw, to retire
(HALOT 268)
in Job 32:6 (ˁal-kēn zāḥaltī wā-ˀīrā(ˀ) mē-ḥawwōt dēˁī ˀätṯäm); connected either to *ḏḥl - ‘to be afraid’ or to Arb zḥl - to withdraw (cf. Clines 2006:684)
It is assumed in HALOT 267 that this preposition is derived from the verbal root zwl ‘to be worthless, cheap’ (HALOT 266), which is hardly probably (Arakelova 2001:42).