英语词源字典 - 在线词源网站

jet [jet 词源字典]: jet: English has two distinct words jet. The older, which denotes a type of black stone used in jewellery [14], comes via Old French jaiet and Latin gagātēs from Greek gagátēs, which denoted ‘stone from Gagai’, a town in Lycia, in Asia Minor, where it was found. The jet of ‘jet engines’ [16] goes back ultimately to a word that meant ‘throw’ – Latin jacere (from which English also gets inject, project, reject, etc).

A derivative of this was jactāre, which also meant ‘throw’. It passed via Vulgar Latin *jectāre into Old French as jeter, and when English took it over it was originally used for ‘protrude, stick out’: ‘the houses jetting over aloft like the poops of ships, to shadow the streets’, George Sandys, Travels 1615. This sense is perhaps best preserved in jetty ‘projecting pier’, and in the variant form jut [16], while the underlying meaning ‘throw’ is still present in jettison ‘throw things overboard’ and its contracted form jetsam.

But back with the verb jet, in the 17th century it began to be used for ‘spurt out in a forceful stream’. The notion of using such a stream to create forward motion was first encapsulated in the term jet propulsion in the mid 19th century, but it did not take concrete form for nearly a hundred years (the term jet engine is not recorded until 1943).
=> inject, jetsam, jettison, jetty, jut, project, reject, subject[jet etymology, jet origin, 英语词源]
aback (adv.): c. 1200, from Old English on bæc "at or on the back;" see back (n.). Now surviving mainly in taken aback, originally a nautical expression in reference to a vessel's square sails when a sudden change of wind flattens them back against the masts and stops the forward motion of the ship (1754). The figurative sense is first recorded 1840.
dieresis (n.): also diaeresis, 1610s, "sign marking the division of a diphthong into two simple sounds," from Late Latin diaeresis, from Greek diairesis "division," noun of action from diairein "to divide, separate," from dia- "apart" (see dia-) + hairein "to take" (see heresy). In classical prosody, "the slight break in the forward motion of a line that is felt when the end of a foot coincides with the end of a word" [Miller Williams, "Patterns of Poetry"].
from (prep., adv.): Old English fram, preposition denoting departure or movement away in time or space, from Proto-Germanic *fra "forward, away from" (cognates: Old Saxon, Old High German, Gothic fram "from, away," Old Norse fra "from," fram "forward"), from PIE *pro-mo-, suffixed form of *pro (see pro-); the Germanic sense of "moving away" apparently evolved from the notion of "forward motion." It is related to Old English fram "forward; bold; strong," and fremian "promote, accomplish" (see frame (v.)).
march (n.1): "act of marching," 1580s, from march (v.) or else from Middle French marche (n.), from marcher (v.). The musical sense first attested 1570s, from notion of "rhythmic drumbeat" for marching. Transferred sense of "forward motion" is from 1620s.