rot

(noun) a state of decay usually accompanied by an offensive odor. Synonyms: putrefaction.

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

(noun) unacceptable behavior (especially ludicrously false statements). Synonyms: bunk, bunkum, buncombe, guff, hogwash.

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

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