good-byeyoudaoicibaDictYouDict[good-bye 词源字典]
good-bye: [16] The good of good-bye was originally God. The expression is a contraction of God be with you, a form of farewell first recorded in the late 16th century. Its gradual reduction can be traced through a series of metamorphoses (Shakespeare, for instance, had God be wy you and God buy’ ye), and it did not reach modern good-bye until the 18th century. The substitution of good for God seems to have been mainly due to the influence of such phrases as good day and good night.
=> god[good-bye etymology, good-bye origin, 英语词源]
bonjouryoudaoicibaDictYouDict
French, literally "good day," from bon "good," from Latin bonus (see bene-) + jour (see journey (n.)).
euhemerism (n.)youdaoicibaDictYouDict
1846, "the method of regarding myths as glorified accounts of actual events or persons," with -ism + name of Euhemerus, Greek philosopher of Sicily (4c. B.C.E.), who wrote "Iera Anagraphe," in which he maintained the Greek deities actually were historical mortals. His name is literally "good day," from eu "well, good" (see eu-) + hemera "day" (see ephemera). Related: Euhemerist; euhemeristic.
good-byeyoudaoicibaDictYouDict
salutation in parting, also goodbye, good bye, good-by, 1590s, from godbwye (1570s), a contraction of God be with ye (late 14c.), influenced by good day, good evening, etc. As a noun from 1570s. Intermediate forms in 16c. include God be wy you, God b'uy, God buoye, God buy, etc.
good-day (n.)youdaoicibaDictYouDict
early 12c., "a fortunate day," also, generally, "good fortune;" from good (adj.) + day (n.). As a salutation in parting, haue godne day "have good day" is recorded from c. 1200; good day as a greeting is from late 14c.
haggaday (n.)youdaoicibaDictYouDict
mid-14c., "a kind of door latch," and said to be still the name for rings for raising thumb-latches in the north of England. It appears to be what it looks like: what you say when you open the door ("have good day," as in the 1414 record of them as hafgooddays).
time (n.)youdaoicibaDictYouDict
Old English tima "limited space of time," from Proto-Germanic *timon- "time" (cognates: Old Norse timi "time, proper time," Swedish timme "an hour"), from PIE *di-mon-, suffixed form of root *da- "cut up, divide" (see tide (n.)).

Abstract sense of "time as an indefinite continuous duration" is recorded from late 14c. Personified since at least 1509 as an aged bald man (but with a forelock) carrying a scythe and an hour-glass. In English, a single word encompasses time as "extent" and "point" (French temps/fois, German zeit/mal) as well as "hour" (as in "what time is it?" compare French heure, German Uhr). Extended senses such as "occasion," "the right time," "leisure," or times (v.) "multiplied by" developed in Old and Middle English, probably as a natural outgrowth of such phrases as "He commends her a hundred times to God" (Old French La comande a Deu cent foiz).
to have a good time ( = a time of enjoyment) was common in Eng. from c 1520 to c 1688; it was app. retained in America, whence readopted in Britain in 19th c. [OED]
Time of day (now mainly preserved in negation, i.e. what someone won't give you if he doesn't like you) was a popular 17c. salutation (as in "Good time of day vnto your Royall Grace," "Richard III," I.iii.18), hence to give (one) the time of day "greet socially" (1590s); earlier was give good day (mid-14c.). The times "the current age" is from 1590s. Behind the times "old-fashioned" is recorded from 1831. Times as the name of a newspaper dates from 1788.

Time warp first attested 1954; time-traveling in the science fiction sense first recorded 1895 in H.G. Wells' "The Time Machine." Time capsule first recorded 1938, in reference to the one "deemed capable of resisting the effects of time for five thousand years preserving an account of universal achievements embedded in the grounds of the New York World's fair."
Jones [archaeologist of A.D. 5139] potters about for a while in the region which we have come to regard as New York, finds countless ruins, but little of interest to the historian except a calcified direction sheet to something called a "Time Capsule." Jones finds the capsule but cannot open it, and decides, after considerable prying at the lid, that it is merely evidence of an archaic tribal ceremony called a "publicity gag" of which he has already found many examples. ["Princeton Alumni Weekly," April 14, 1939]
To do time "serve a prison sentence" is from 1865. Time frame is attested by 1964; time-limit is from 1880. About time, ironically for "long past due time," is recorded from 1920.