What is the origin of "eyewash"?
I was passing a sign today that said Eyewash, meaning a place where one could wash an eye that had some foreign matter in it; a common thing in laboratories and factories. But the first impression I gained was of eyewash, meaning something close to poppycock or codswallop.
This set me to wondering what the origin of this term was; Green's Dictionary of Slang doesn't even include this as a headword. This source here suggests it is the verbal equivalent of a wink; is that so? Does anyone know more about it?
Edit Sorry if this wasn't immediately apparent but it was the slang term I am most interested in.
Solution 1:
The two meanings included in the Oxford English Dictionary for eyewash are:
A wash or lotion for the eye.
colloq. Something that is intended to obscure or conceal actual facts or motives; humbug, blarney; nonsense; something said or done merely for appearance or effect; spec. in Mil. slang = bull n.4 4.
The colloquial sense has written use dating from the 1800s:
1884 C. T. Buckland Sketch Social Life India ii. 45 Most officers of any tact understand the meaning of eye~wash.
The Wordsworth Dictionary of Phrase gives some explanation of why eyewash also means to "obscure something", writing:
So this "fulsome adulation" is figuratively putting a wash over someone's eyes. There are no clear references on where this "wash" came from. It could be from the first meaning of eyewash--if you are flattering someone, you are figuratively putting some type of wash in their eyes that prevents them from seeing your true intentions. It could also be from a meaning of "wash" as in a coat of paint (a wash of watercolor), so you are again obscuring someone's vision. I would guess that the slang sense was actually a figurative application of the first sense, however.