What does rust mean in the Bible?

Answer 1

Matthew 6:19 "Do not lay up for yourselves treasures on earth, where moth and rust destroy and where thieves break in and steal;

The word that is translated into English here means "eating".

The word translated rust here does not really mean the rust of metals but whatever corrupts and consumes things eatable, such as mildew in corn, or any sort of vermin in granaries.

In this verse there are are three sorts of earthly treasures, which are liable to be corrupted, or taken away: garments, which may be destroyed, and rendered useless for wearing; things eatable, as all sorts of corn and grain, which may be so corrupted by mold, mildew and vermin, and money and jewels, which may be stolen by thieves. No sort of worldly riches and treasure is safe