Cankered (κατιὀομαι)

James 5:3
The gold and silver of the rich who have oppressed the poor is “rusted,” and the “rust” thereof shall be a witness against them (James 5:33Your gold and silver is cankered; and the rust of them shall be a witness against you, and shall eat your flesh as it were fire. Ye have heaped treasure together for the last days. (James 5:3)).