썩다

For a food or natural organism to go bad or become worse by being decomposed by bacteria.

For a part of the body such as a tooth or skin to stop functioning due to bacterial infections and become largely irreparable.

For a metal object to rust badly or for a wooden item to become fragile.

For an object, person or person's talent to not function well or be wasted.

For one's mind or society to become unhealthy and morally bad.

For one's facial skin to look dark, dull and moistureless.

To be common and abundant.

To be tormented by a worry, concern, etc.

(slang) To be stuck in a place against one's will.