rotting

(noun) (biology) the process of decay caused by bacterial or fungal action. Synonyms: decomposition, rot, putrefaction.

(verb) break down. Synonyms: decompose, rot, molder, moulder. Example: "The bodies decomposed in the heat."

(verb) become physically weaker. Synonyms: waste, rot. Example: "Political prisoners are wasting away in many prisons all over the world."