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1 [uncountable]HB the natural process of decaying, or the part of something that has decayed : 
the smell of rotwood that is soft with rot ➔ dry rot
the smell of rotwood that is soft with rot2 [singular,uncountable] a state in which something becomes bad or does not work as well as it should : He criticized the talk shows as 'cultural rot'.
He criticized the talk shows as 'cultural rot'. stop the rot British English (=stop a bad situation getting worse) The team has enough good players to stop the rot.
The team has enough good players to stop the rot. the rot set in British English (=a situation started to get worse) It was after he left the company that the rot set in.
It was after he left the company that the rot set in.3 [uncountable] British English old-fashioned nonsense : You do talk rot!
You do talk rot!