noun, noun or participle which takes 'suru'
full operation; running at full capacity
Used for machines, systems, or people working at maximum output or speed. Often appears with する to mean 'operate at full capacity'.
工場のラインがフル回転している。
The factory line is running at full capacity.
彼は頭をフル回転させて問題を解
He solved the problem with his brain working at full speed.