What is the meaning of rot?

noun

• A state of decay usually accompanied by an offensive odor.
  • synonyms: putrefaction
• Biology) the process of decay caused by bacterial or fungal action.
  • synonyms: decomposition, rotting, putrefaction
• Unacceptable behavior (especially ludicrously false statements.
  • synonyms: bunk, bunkum, buncombe, guff, hogwash

verb

• Break down.
  • usage: "The bodies decomposed in the heat"
  • synonyms: decompose, molder, moulder
• Become physically weaker.
  • usage: "Political prisoners are wasting away in many prisons all over the world"
  • synonyms: waste