Lewis & Short

aerūgĭno, avi, atum, 1, v. n. [aerugo],

  1. I. to become rusty, cankered (eccl.): aurum et argentum vestrum aeruginavit, Vulg. Jac. 5, 3.
  2. II. Trop.: sicut aeramentum, aeruginat nequitia illius, Vulg. Eccli. 12, 10.