guineayoudaoicibaDictYouDict[guinea 词源字典]
guinea: [17] Guinea first emerged as the name of a section of the West Africa continent in the late 16th century (its origins are not known, but presumably it was based on an African word). In 1663 the Royal Mint began to produce a gold coin valued at 20 shillings ‘for the use of the Company of Royal Adventurers of England trading with Africa’. It had the figure of an elephant on it.

Straightaway it became known as a guinea, both because its use was connected with the Guinea coast and because it was made from gold obtained there. And what is more, the coins soon came to be much in demand for domestic use: on 29 October 1666 Samuel Pepys recorded ‘And so to my goldsmith to bid him look out for some gold for me; and he tells me that Ginnys, which I bought 2000 of not long ago, and cost me but 18½d. change, will now cost me 22d., and but very few to be had at any price.

However, some more I will have, for they are very convenient – and of easy disposal’. Its value fluctuated, and was not fixed at 21 shillings until 1717. The last one was minted in 1813, but guinea as a term for the amount 21 shillings stayed in use until the early 1970s, when the decimalization of British currency dealt it the deathblow. The guinea pig [17], incidentally, comes from South America, and its name probably arose from a confusion between Guinea and Guiana, on the northern coast of South America.
[guinea etymology, guinea origin, 英语词源]
soonyoudaoicibaDictYouDict
soon: [OE] In Old English times, soon meant ‘straightaway’, but human nature being what it is, the tendency to procrastinate led over the centuries to a change in meaning to ‘after a short while’. (The same thing happened to anon, and is in the process of happening to directly.) The word itself comes from a prehistoric West Germanic *sǣnō, whose other descendants apart from soon have all but died out.
straightyoudaoicibaDictYouDict
straight: [14] Straight began life as the past participle of stretch. Nowadays this verb has a perfectly normal past form (stretched), but in Middle English it was straught (source of distraught [14], an alteration of distract) or straight – whence the adjective straight. The sense ‘not bent or curved’ derives from the notion of stretching something between two points. Straightaway [15] originally meant ‘by a straight path’; the temporal sense ‘immediately’ emerged in the 16th century.
=> distract, distraught, stretch
stretch (n.)youdaoicibaDictYouDict
late 12c., "expanse of land;" 1540s, "act of stretching," from stretch (v.); meaning "unbroken continuance of some activity" is first recorded 1660s; meaning "straightaway of a race course" (as in home stretch) is recorded from 1839.