spin down

spin down (third-person singular simple present spins down, present participle spinning down, simple past and past participle spun down)

1. (of a rotating body) To reduce its speed of rotation.
2. (figuratively) To diminish in energy; to slow down or peter out; to be gradually canceled or ended.
3. (computing, intransitive, of a disk drive) To reduce its spinning speed from that required for reading and writing.