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godspeed (interj.)[godspeed 词源字典]: also God speed, by late 14c., "(I wish that) God (may) grant you success," from God + speed (v.) in its old sense of "prosper, grow rich, succeed." Specifically as a salutation by mid-15c. Also in Middle English as an adverb, "quickly, speedily" (early 14c.); the then-identically spelled God and good seem to be mixed up in this word. From late 13c. as a surname. He may bidde god me spede is found in a text from c. 1300.[godspeed etymology, godspeed origin, 英语词源]
mixed (adj.): mid-15c., from mix (n.). Mixed blessing from 1933. Mixed marriage is from 1690s (originally in a religious context; racial sense was in use by 1942 in U.S., though mixed breed in reference to mulattoes is found by 1775). Mixed bag "heterogeneous collection" is from 1936. Mixed up is from 1884 as "confused," from 1862 as "involved."

Mixed drink in the modern liquor sense is recorded by 1868; the thing itself is older; Bartlett (1859) lists sixty names "given to the various compounds or mixtures of spirituous liquors and wines served up in fashionable bar rooms in the United States," all from a single advertisement. The list includes Tippe na Pecco, Moral suasion, Vox populi, Jewett's fancy, Ne plus ultra, Shambro, Virginia fancy, Stone wall, Smasher, Slingflip, Pig and whistle, Cocktail, Phlegm-cutter, Switchel flip, Tip and Ty, Ching-ching, Fiscal agent, Slip ticket, Epicure's punch.
Three Rs (n.): 1824; said to have been given as a toast by Sir William Curtis (1752-1829), a beloved lord mayor of London in the 1820s, who seems to have been a figure of fun to whom many mangled phrases were attributed. Among the toasts he is alleged to have given at public dinners were "The Female Ladies of London;" "The three C's--Cox, King, and Curtis;" and "The three R's--Reading, Writing, and Rithmetic."
It has been very much the fashion amongst a class of persons to attribute to Sir W. C. ... a vulgarity and ignorance of speech which are by no means consistent with his character and conduct. The worthy and hospitable baronet has a rapid mode of speech, but it is always correct ; and although some eccentricities are mixed up in his composition, he is highly honourable, and has been a very useful member of society, particularly to his London constituents. ["The Mirror," Jan. 29, 1825]
After listing some examples, the article continues:
It is, however, very certain, that at a city festival some years ago, having indulged very freely, he fell asleep, when some wag, choosing to consider him dead, wrote his epitaph, which was found next morning pinned to the baronet's dress coat:--

"Here lies the great Curtis,
Of London, Lord May'r:
He's left this here world,
And gone to that there."