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spook

noun

  1. a specter; ghost
  2. any person suggestive of a specter or ghost, as an eccentric, a secret agent, etc.

transitive verb

  1. to haunt (a person or place)
  2. to startle, frighten, make nervous, annoy, etc.

intransitive verb

to become frightened or startled

See spook in American Heritage Dictionary 4

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