The jaws; or, the jaw-bones; or, the grinders, the sharpest and strongest teeth in the jaw, i.e. their power and violence wherewith they used to oppress others. It is a metaphor from wild beasts, which break their prey with their teeth. Compare Psalms 3:7, Psalms 57:4 58:6. Plucked the spoil out of his teeth, i.e. forced them to restore what they had violently and unjustly taken away.
Related Commentaries of Job 29:17
Job 29:17
17 And I brake the jawsd of the wicked, and plucked the spoil out of his teeth.