Meaning of spook

spook

1. a ghost; specter.
2. a ghostwriter.
3. an eccentric person.
4. . a black person.
5. an espionage agent; spy.

1. to haunt; inhabit or appear in or to as a ghost or specter.
2. to frighten; scare.

1. to become frightened or scared: The fish spooked at any disturbance in the pool.