Etymology
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Murphy 

common Irish surname, Gaelic Murchadh "sea-warrior." The Celtic "sea" element is also in names Muriel (q.v.), Murdoch (Old Irish Muireadhach, Old Welsh Mordoc "mariner"), etc. As colloquial for "a potato" by 1811, apparently in allusion ot it being a staple food of the Irish.

Murphy bed (1912; in full Murphy In-A-Dor Bed) is named for U.S. inventor William Lawrence Murphy (1876-1959). By happy coincidence, Murphy was an illiterate 18c.-19c. perversion of Morpheus, god of sleep. Murphy's law (1958) is used of various pessimistic aphorisms. If there ever was a real Murphy his identity is lost to history. Said to be military originally, and it probably pre-dates the earliest printed example (the 1958 citation calls it "an old military maxim").

No history of the subject would be complete without some reference to the semilegendary, almost anonymous Murphy (floreat circa 1940?) who chose to disguise his genius by stating a fundamental systems theorem in commonplace, almost pedestrian terminology. This law, known to schoolboys the world over as Jellybread always falls jelly-side down, is here restated in Murphy's own words, as it appears on the walls of most of the world's scientific laboratories:
If Anything Can Go Wrong, It Will.
[John Gall, "Systemantics," 1975]
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Macbeth 

masc. proper name, Gaelic, literally "son of life." The first reference to bad luck associated with Shakespeare's "Macbeth," and to avoidance of naming it, is from 1896, alludes to an incident of 1885, and says the tradition goes back "so far as modern memory can recall." The original superstition seems to have pertained particularly to the witches' scenes, which were played up dramatically in 19c. productions, and especially to Matthew Locke's 17c. music to accompany the witches' song, which was regularly played through the 19th century.

It is strange how the effect of this music has exerted such a long surviving influence on members of the dramatic profession. It is still considered most unlucky to sing, hum, or whistle the witch airs in the theatre except in the ways of business. [Young-Stewart, "The Three Witches," in The Shakespearean, Sept. 15, 1896]
If you number an actor or actress among your friends, and desire to retain his or her friendship, there are three things you positively must not do, especially if the actor is of the old school. Do not whistle in the theatre, do not look over his shoulder into the glass while he is making up, and do not hum the witch's song from "Macbeth." ... [O]lder actors would almost prefer to lose their salary than go on in "Macbeth" on account of this song. They believe that it casts spells upon the members of the company. ["Some Odd Superstitions of the Stage," Theatre magazine, July 1909]
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Easter (n.)
Origin and meaning of Easter

Old English Easterdæg, from Eastre (Northumbrian Eostre), from Proto-Germanic *austron-, "dawn," also the name of a goddess of fertility and spring, perhaps originally of sunrise, whose feast was celebrated at the spring equinox, from *aust- "east, toward the sunrise" (compare east), from PIE root *aus- (1) "to shine," especially of the dawn.

Bede says Anglo-Saxon Christians adopted her name and many of the celebratory practices for their Mass of Christ's resurrection. Almost all neighboring languages use a variant of Latin Pascha to name this holiday (see paschal).

Easter egg is attested by 1825, earlier pace egg (1610s). Easter bunny is attested by 1904 in children's lessons; Easter rabbit is by 1888; the paganish customs of Easter seem to have grown popular c. 1900; before that they were limited to German immigrants.

If the children have no garden, they make nests in the wood-shed, barn, or house. They gather colored flowers for the rabbit to eat, that it may lay colored eggs. If there be a garden, the eggs are hidden singly in the green grass, box-wood, or elsewhere. On Easter Sunday morning they whistle for the rabbit, and the children imagine that they see him jump the fence. After church, on Easter Sunday morning, they hunt the eggs, and in the afternoon the boys go out in the meadows and crack eggs or play with them like marbles. Or sometimes children are invited to a neighbor's to hunt eggs. [Phebe Earle Gibbons, "Pennsylvania Dutch," Philadelphia, 1882]
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Viking (n.)

Scandinavian pirate, 1801, vikingr, in "The History of the Anglo-Saxons" by English historian Sharon H. Turner; he suggested the second element might be connected to king: But this later was dismissed as incorrect. The form viking is attested in 1820, in Jamieson's notes to "The Bruce."

The name by which the pirates were at first distinguished was Vikingr, which perhaps originally meant kings of the bays. It was in bays that they ambushed, to dart upon the passing voyager. [Turner]

The word is a historians' revival; it was not used in Middle English, but it was reintroduced from Old Norse vikingr "freebooter, sea-rover, pirate, viking," which usually is explained as meaning properly "one who came from the fjords," from vik "creek, inlet, small bay" (cognate with Old English wic, Middle High German wich "bay," and second element in Reykjavik).

But Old English wicing and Old Frisian wizing are almost 300 years older than the earliest attestation of the Old Norse word, and probably derive from wic "village, camp" (large temporary camps were a feature of the Viking raids), related to Latin vicus "village, habitation" (from PIE root *weik- (1) "clan").

The connection between the Norse and Old English words is still much debated. The period of Viking activity was roughly 8c. to 11c. In the Anglo-Saxon Chronicle, the raiding armies generally were referred to as þa Deniscan "the Danes," while those who settled in England were identified by their place of settlement. Old Norse viking (n.) meant "freebooting voyage, piracy;" one would "go on a viking" (fara í viking).

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