From Latin 'jūs' (broth, sauce), via Old French — originally any extracted liquid.
The liquid from fruit, vegetables, or meat.
From Old French 'jus' (juice, sap), from Latin 'jūs' (broth, sauce), from PIE *yewH-s- (broth, mixture). Key roots: *yewH-s- (PIE: "broth, mixture").