Putrefy (verb)

1. Cause (organic matter) to decay or become rotten.
2. Cause (a body or substance) to rot or decompose as a result of bacterial action.
3. Cause (something) to become morally or spiritually corrupt or degenerate.

Origin:

Late middle english: from old french putrefier, from latin putrefacere, from putrere "to rot" + facere "to make".

Examples:

1. The hot and humid weather putrefied the food in the cooler.
2. The body was left in the open air, allowing it to putrefy.
3. The exposure to sunlight putrefied the organic matter in the water.
4. The lack of hygiene allowed bacteria to putrefy the wound.
5. The corrupt government putrefied the once thriving economy.