verb

1. To suffer decomposition due to biological action, especially by fungi or bacteria.

   “The apple left in the cupboard all that time had started to rot.”

2. To decline in function or utility.

   “Your brain will rot if you spend so much time on the computer, Tony!”

3. To (cause to) deteriorate in any way, as in morals; to corrupt.

Synonyms: putrefy

noun

1. The process by which something rots.

2. Material that has rotted.