The term deadeye means
(informal, chiefly North American) An expert marksman
Oxford Dictionaries Online
(There is an apparently unrelated sense of the term referring to a specific type of nautical block.)
Numerous other online dictionaries give nearly identical meanings, and a few also list it as an adjective with an equivalent meaning. But none of these sources give an etymology.
A search on etymonline.com gives no results.
A quick review of ngrams shows the term being used as a name or nickname as early as 1829 and a character known as Dick Deadeye appears in Gilbert and Sullivan’s HMS Pinafore, but none of these 19th century cites seem to relate to a marksmanship characteristic.
There also seems to be a series of dime novels featuring Deadeye Dick, but I cannot find any text to indicate if the name is associated with a sharpshooting skill.
So, can anyone assist with the origin of the term deadeye to mean marksman?
Best Answer
I think this is related to the phrase "dead on," which is also used in marksmanship and comes from the fact that what makes a shot successful is often that it's fatal.
OED has:
For dead-hand:
It seems like "dead-eyed" is a variant of "sure-eyed" using this sense of 'dead.'
Edit- Just to make this explicit: skilled marksmen are often referred to as "sure-eyed," "keen-eyed," "true-eyed," etc. because of the importance of vision in getting a good shot.
Edit 2: Bib asked how 'dead' came to mean 'total' or 'exact.' The 'quite certain, sure, unerring' sense I quoted first says cf. dead certainty in sense A. 31a, which is
The "various earlier senses" seem to be along the lines of 'completely still':
A.18:
A.22:
It is plausible to me that the sense involved in 'dead shot' arose fairly independently, though, because of the close connection between shooting accuracy and death.
This 1906 United Service Magazine has the earliest use of "dead eye" for a marksman I can find:
This early use of "dead eye" as someone who is really proficient at target shooting is really notable. It suggests to me that the term may be more closely connected to "bull's eye" than I expected—like "dead on the bull's eye" or "dead shot to the bull's eye."
Such an origin would also explain why I'm not finding any early "dead-eyed" references, which you'd expect if it came from "sure-eyed."
Edit: The use of "bull's eye shot" to refer to a person is also noteworthy: "We do not require the "bull's eye shot" for this, but only a man who has been carefully drilled..."