rottenness; decay; corruption
Refers to the state of being rotten, physically or metaphorically. Often used in compounds like 腐りかけ (starting to rot) or 腐りやすい (perishable).
This fruit rots quickly.
We need to root out the corruption in the organization.
become completely corrupt; rot away entirely
Noun form of the verb 腐る (to rot), derived from the classical verb 腐る (くたる) with the same meaning.