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incident [incident 词源字典]: incident: [15] An incident is literally that which ‘befalls’. In common with accident and occident, and a wide range of other English words, from cadaver to occasion, it comes ultimately from Latin cadere ‘fall’. This was combined with the prefix in- ‘on’ to produce incidere ‘fall on’, hence ‘befall, happen to’. Its present participial stem incident- passed into English either directly or via French.

The use of a word that literally means ‘fall’ to denote the concept of ‘happening’ is quite a common phenomenon. It occurs also in befall and chance, and operates in other languages than English; Welsh digwydd ‘happen’, for instance, is derived from cwyddo ‘fall’.
=> accident, cadence, case, occasion[incident etymology, incident origin, 英语词源]
act (n.): late 14c., "a thing done," from Old French acte "(official) document," and directly from Latin actus "a doing, a driving, impulse; a part in a play, act," and actum "a thing done," originally a legal term, both from agere "to do, set in motion, drive, urge, chase, stir up," from PIE root *ag- "to drive, draw out or forth, move" (cognates: Greek agein "to lead, guide, drive, carry off," agon "assembly, contest in the games," agogos "leader;" Sanskrit ajati "drives," ajirah "moving, active;" Old Norse aka "to drive;" Middle Irish ag "battle").

Theatrical ("part of a play," 1510s) and legislative (early 15c.) senses of the word also were in Latin. Meaning "display of exaggerated behavior" is from 1928. In the act "in the process" is from 1590s, perhaps originally from the 16c. sense of the act as "sexual intercourse." Act of God "uncontrollable natural force" recorded by 1726.
An act of God is an accident which arises from a cause which operates without interference or aid from man (1 Pars. on Cont. 635); the loss arising wherefrom cannot be guarded against by the ordinary exertions of human skill and prudence so as to prevent its effect. [William Wait, "General Principles of the Law," Albany, 1879]
black box (n.): 1947, RAF slang for "navigational instruments;" later extended to any sort of apparatus that operates in a sealed container. Especially of flight recorders from c. 1964.
-eer: noun word-forming element meaning "one who" (operates, produces, deals in); anglicized form of French -ier, from Latin -arius, -iarius; compare -ary.
pull (v.): c. 1300, "to move forcibly by pulling, to drag," from Old English pullian "to pluck off (wool), to draw out," of unknown origin, perhaps related to Low German pulen "remove the shell or husk," Frisian pûlje "to shell, husk," Middle Dutch polen "to peel, strip," Icelandic pula "work hard."

Early 14c. as "to pick, pull off, gather" (fruit, flowers, berries, leaves, petals, etc.); mid-14c. as "to uproot, pull up" (of teeth, weeds, etc.). Sense of "to draw, attract" (to oneself) is from c. 1400; sense of "to pluck at with the fingers" is from c. 1400. Meaning "tear to pieces" is mid-15c. By late 16c. it had replaced draw in these senses. Related: Pulled; pulling.

Common in slang usages 19c.-20c.; Bartlett (1859) has to pull foot "walk fast; run;" pull it "to run." To pull up "check a course of action" is from 1808, figurative of the lifting of the reins in horse-riding. To pull (someone's) chain in figurative sense is from 1974, perhaps on the notion of a captive animal; the expression was also used for "to contact" (someone), on the notion of the chain that operates a signaling mechanism.

To pull (someone's) leg is from 1882, perhaps on notion of "playfully tripping" (compare pull the long bow "exaggerate," 1830, and pulling someone's leg also sometimes was described as a way to awaken a sleeping person in a railway compartment, ship's berth, etc.). Thornton's "American Glossary" (1912) has pull (n.) "a jest" (to have a pull at (someone)), which it identifies as "local" and illustrates with an example from the Massachusetts "Spy" of May 21, 1817, which identifies it as "a Georgian phrase." To pull (one's) punches is from 1920 in pugilism, from 1921 figuratively. To pull in "arrive" (1892) and pull out "depart" (1868) are from the railroads.

To pull (something) off "accomplish, succeed at" is originally in sporting, "to win the prize money" (1870). To pull (something) on (someone) is from 1916; to pull (something) out of one's ass is Army slang from 1970s. To pull rank is from 1919; to pull the rug from under (someone) figuratively is from 1946.
synergism (n.): 1650s, "theological doctrine that human will cooperates with divine grace in regeneration" (implying that the fall did not cost the soul all inclination toward holiness), from Modern Latin synergismus, from Greek synergos "working together" (see synergy). Used in non-theological sense "a working together, cooperation" by 1910 (first of medicines).
typist (n.): 1843, "compositor," from type (n.) + -ist. Meaning "person who operates a typewriter" is from 1884.