Definition of spin up:
(v) :
(computing, transitive) To power up, launch, or instantiate.
(v) :
(computing, intransitive, of a disk drive) To reach a sufficient spinning speed for reads and writes to take place.
(v) :
(figurative, intransitive) To be brought into full operation; to reach full potential or capacity; to spool up.
(v) :
(figurative, transitive) To fabricate.