What are stagnates?

'Stagnate' has a few senses or meanings: 1: cause to stagnate; 2: cease to flow; stand without moving; 3: be idle; exist in a changeless situation; 4: stand still

After 10 days in the dank basement, the water had gone stagnante

growth, industry.

Once the stream was diverted the pond was deprived of its inflow of fresh water and rapidly began to stagnate.

I'm at a total loss as to why anyone would think karate or any other martial art would stagnate growth. Unless it is run in the form of an ultimate fighting tournament and results in major damage to...