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affect [affect 词源字典]: affect: There are two distinct verbs affect in English: ‘simulate insincerely’ [15] and ‘have an effect on’ [17]; but both come ultimately from the same source, Latin afficere. Of compound origin, from the prefix ad- ‘to’ and facere ‘do’, this had a wide range of meanings. One set, in reflexive use, was ‘apply oneself to something’, and a new verb, affectāre, was formed from its past participle affectus, meaning ‘aspire or pretend to have’.

Either directly or via French affecter, this was borrowed into English, and is now most commonly encountered in the past participle adjective affected and the derived noun affectation. Another meaning of afficere was ‘influence’, and this first entered English in the 13th century by way of its derived noun affectiō, meaning ‘a particular, usually unfavourable disposition’ – hence affection.

The verb itself was a much later borrowing, again either through French or directly from the Latin past participle affectus.
=> fact[affect etymology, affect origin, 英语词源]
assess: assess: [15] The literal meaning of Latin assidēre, ultimate source of assess, was ‘sit beside someone’ (it was a compound verb formed from the prefix ad- ‘near’ and sedēre ‘sit’, a relative of English sit). This developed the secondary meaning ‘sit next to a judge and assist him in his deliberations’ (which lies behind English assize), and in medieval Latin the sense passed from helping the judge to performing his functions, particularly in fixing the amount of a fine or tax to be paid.

Hence English assess, which came via Old French assesser from Latin assess-, the past participial stem of assidēre. (The Latin adjective assiduus, formed from assidēre in the sense ‘apply oneself to something’, gave English assiduous [16].)
=> assiduous, assize, session, sit, size
follow (v.): Middle English folwen, from Old English folgian, fylgian, fylgan "to accompany (especially as a disciple), move in the same direction as; follow after, pursue, move behind in the same direction," also "obey (a rule or law), conform to, act in accordance with; apply oneself to (a practice, trade, or calling)," from Proto-Germanic *fulg- (cognates: Old Saxon folgon, Old Frisian folgia, Middle Dutch volghen, Dutch volgen, Old High German folgen, German folgen, Old Norse fylgja "to follow"). Probably originally a compound, *full-gan, with a sense of "full-going," the sense then shifting to "serve, go with as an attendant" (compare fulfill). Related: Followed; following.

Sense of "accept as leader or guide, obey or be subservient to" was in late Old English. Meaning "come after in time" is from c. 1200; meaning "to result from" (as effect from cause) is from c. 1200. Meaning "to keep up with mentally, comprehend" is from 1690s. Intransitive sense "come or go behind" is from mid-13c. To follow one's nose "go straight on" first attested 1590s. "The full phrase is, 'Follow your nose, and you are sure to go straight.' " [Farmer]. The children's game follow my leader is attested by that name from 1812 (as follow the leader by 1896).
incumbent (n.): early 15c., "person holding a church position," from Medieval Latin incumbentem (nominative incumbens) "holder of a church position," noun use of present participle of incumbere "to obtain or possess," from Latin incumbere "recline on," figuratively "apply oneself to," from in- "on" (see in- (2)) + -cumbere "lie down," related to cubare "to lie" (see cubicle). Extended to holders of any office from 1670s.
knuckle (n.): mid-14c., knokel "finger joint; any joint of the body, especially a knobby one; morbid lump or swelling;" common Germanic (cognates: Middle Low German knökel, Middle Dutch cnockel, German knöchel), literally "little bone," a diminutive of Proto-Germanic root *knuk- "bone" (compare German Knochen "bone).

As a verb from 1740, originally in the game of marbles. To knuckle down "apply oneself earnestly" is 1864 in American English, extended from marbles (putting a knuckle on the ground in assuming the hand position preliminary to shooting); to knuckle under "submit, give in" is first recorded 1740, supposedly from the former more general sense of "knuckle" and here meaning "knee," hence "to kneel." The face-busting knuckle-duster is from 1858 (a duster was a type of protective coat worn by workmen).
study (v.): early 12c., "to strive toward, devote oneself to, cultivate" (translating Latin occupatur), from Old French estudiier "to study, apply oneself, show zeal for; examine" (13c., Modern French étudier), from Medieval Latin studiare, from Latin studium "study, application," originally "eagerness," from studere "to be diligent" ("to be pressing forward"), from PIE *(s)teu- (1) "to push, stick, knock, beat" (see steep (adj.)).
Martha swanc and becarcade to geforðigene þan Hælende and his þeowen þa lichamlice behefðen. Seo studdede emb þa uterlice þing. [Homily for the Feast of the Virgin Mary, c.1125]
From c. 1300 as "apply oneself to the acquisition of learning, pursue a formal course of study," also "read a book or writings intently or meditatively." From mid-14c. as "reflect, muse, think, ponder." Meaning "regard attentively" is from 1660s. Related: Studied; studying.