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In many books, I've seen the word 'spook' used to mean some kind of spy. Definition 5 on dictionary.reference.com confirms this usage, but is not very helpful about the origin.

Does anyone know how this definition came about? More details (does it only refer to American spies? only spies friendly to the speaker?) would also be appreciated.

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Nothing to back this up, but logically both ghosts (spooks) and spies are metaphorically invisible and undesirable. –  C. Ross Sep 16 '10 at 19:01

3 Answers 3

up vote 10 down vote accepted

From the OED:

slang (orig. and chiefly U.S.). An undercover agent; a spy.

1942 BERREY & VAN DEN BARK Amer. Thes. Slang §458/16 ‘Spotter.’ (One who spys upon employees.).. Silent eye, spook, spotter. Ibid. §765/7 Rat, rubber heel, spook, spotter, a person employed to detect irregularities. 1954 People (Austral.) 3 Nov. 24/1 The spooks were senior constables who wore no uniform, worked in pairs and followed constables about the city and suburbs to see if they did their work properly. 1961 John o' London's 20 Apr. 434/1 The idea of making a living as a spy ‘spook’ in current Washington slang is repugnant to most of us. 1966 R. THOMAS Spy in Vodka (1967) vi. 50 I'd like him to get out of the spook business. 1979 L. PRYOR Viper i. 9 ‘My training was also in espionage at the CIA farm.’.. ‘A spook,’ I said in wonder.

This suggests the word would be mainly used in reference to American spies, but I think the 1954 reference is Australians talking about constables, so at least occasionally it has referred to any undercover person.

Not much information on why exactly the word was chosen, but it probably was an easy jump from "ghost that haunts people" to "mysterious secret agent who spies on people".

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Etymonline says:

Meaning "undercover agent" is attested from 1942. [...] The verb is first recorded 1867 in sense of "to walk or act like a ghost".

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A spook is the agent tasked with "erasing an issue". Differing from a spy, a spook does not exist on paper anywhere.

They are black op "kites" at a moments notice they can be cut loose with absolutely no repercussions on an agency,

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