英语词源字典 - 在线词源网站

switch [switch 词源字典]: switch: [16] Switch originally denoted a ‘thin flexible twig’; it may have been borrowed from Middle Dutch swijch ‘bough, twig’. From the noun was derived the verb switch. This originally meant ‘beat with a switch’, but in the early 19th century the sense ‘bend or waggle to and fro like a flexible stick’ emerged, and this led on in the middle of the century via ‘divert’ to ‘turn off a train on to another track’ (the usage developed in American English, where the apparatus used for this is still known as a switch, as opposed to British English points).

By the end of the century this had broadened out to ‘connect or disconnect by pushing a contact to or fro’. The notion of ‘exchanging’ or ‘swopping’ did not emerge until as recently as the 1890s.
[switch etymology, switch origin, 英语词源]
temper: temper: [OE] The verb temper was borrowed into Old English from Latin temperāre ‘mix, blend’. This seems originally to have meant ‘mix in due proportion’, and so may have been derived from Latin tempus ‘time, due time’ (source of English temporary). The noun temper was derived from the verb in the 14th century in the sense ‘mixture of elements’, and this led on in the 17th century to ‘set of mental traits’ (a meaning that has now largely passed to the derivative temperament [15]).

The modern sense ‘ill humour’ emerged from this in the 19th century. Another meaning of Latin temperāre was ‘restrain oneself’, which has come through into the derivatives temperance [14] and temperate [14]. Other relatives include distemper and temperature. Tamper probably originated as an alteration of temper.
=> distemper, tamper, tempera, temperature
pain (v.): c. 1300, "to exert or strain oneself, strive; endeavor," from Old French pener (v.) "to hurt, cause pain," from peine, and from Middle English peine (n.); see pain (n.). Transitive meaning "cause pain; inflict pain" is from late 14c. That of "to cause sorrow, grief, or unhappiness" also is from late 14c. Related: Pained; paining.
stress (n.): c. 1300, "hardship, adversity, force, pressure," in part a shortening of Middle English distress (n.); in part from Old French estrece "narrowness, oppression," from Vulgar Latin *strictia, from Latin strictus "tight, compressed, drawn together," past participle of stringere "draw tight" (see strain (v.)). Meaning "physical strain on a material object" is from mid-15c. As an abstract force in mechanics from 1855. The purely psychological sense is attested from 1955.
tax (v.): c. 1300, "impose a tax on," from Old French taxer "impose a tax" (13c.) and directly from Latin taxare "evaluate, estimate, assess, handle," also "censure, charge," probably a frequentative form of tangere "to touch" (see tangent (adj.)). Sense of "to burden, put a strain on" first recorded early 14c.; that of "censure, reprove" is from 1560s. Its use in Luke ii for Greek apographein "to enter on a list, enroll" is due to Tyndale. Related: Taxed; taxing.
temper (v.): late Old English temprian "to moderate, bring to a proper or suitable state, to modify some excessive quality, to restrain within due limits," from Latin temperare "observe proper measure, be moderate, restrain oneself," also transitive, "mix correctly, mix in due proportion; regulate, rule, govern, manage," usually described as from tempus "time, season" (see temporal), with a sense of "proper time or season." Meaning "to make (steel) hard and elastic" is from late 14c. Sense of "to tune the pitch of a musical instrument" is recorded from c. 1300. Related: Tempered; tempering.
Tironian: of or pertaining to Marcus Tullius Tiro, Cicero's scribe and namesake, 1828, especially in reference to the Tironian Notes (Latin notæ Tironianæ), a system of shorthand said to have been invented by him (see ampersand).
Although involving long training and considerable strain on the memory, this system seems to have practically answered all the purposes of modern stenography. It was still in familiar use as late as the ninth century. [Century Dictionary]