Etymology
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catharsis (n.)

1770, "a bodily purging" (especially of the bowels), from Latinized form of Greek katharsis "purging, cleansing," from stem of kathairein "to purify, purge," from katharos "pure, clear of dirt, clean, spotless; open, free; clear of shame or guilt; purified" (with most of the extended senses now found in Modern English clear, clean, pure), which is of unknown origin.

Originally medical in English; of emotions, "a purging through vicarious experience," from 1872; psychotherapy sense first recorded 1909, in Brill's translation of Freud's "Selected Papers on Hysteria."

The German abreagiren has no exact English equivalent. It will therefore be rendered throughout the text by "ab-react," the literal meaning is to react away from or to react off. It has different shades of meaning, from defense reaction to emotional catharsis, which can be discerned from the context. [footnote, pp. 5-6]
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confound (v.)

c. 1300, "to condemn, curse," also "to destroy utterly;" from Anglo-French confoundre, Old French confondre (12c.) "crush, ruin, disgrace, throw into disorder," from Latin confundere "to confuse, jumble together, bring into disorder," especially of the mind or senses, "disconcert, perplex," properly "to pour, mingle, or mix together," from assimilated form of com "together" (see con-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour").

From mid-14c. as "to put to shame, disgrace." The figurative sense of "confuse the mind, perplex" emerged in Latin, passed into French and thence to English by late 14c. The Latin past participle confusus, meanwhile, became confused (q.v.). The meaning "treat or regard erroneously as identical" is from 1580s.

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Jekyll and Hyde 

in reference to opposite aspects of a person's character is a reference to Robert Louis Stevenson's story, "The Strange Case of Dr. Jekyll and Mr. Hyde," published in 1886. Jekyll, the surname of the respectful and benevolent man, is of Breton origin and was originally a personal name. Hyde in reference to the dark, opposite side of one's personality is from 1887.

"Though so profound a double-dealer, I was in no sense a hypocrite. Both sides of me were in dead earnest; I was no more myself when I laid aside restraint and plunged in shame, than when I labored, in the eye of day, at the furtherance of knowledge or the relief of sorrow and suffering." [Robert Louis Stevenson, "The Strange Case of Dr. Jekyll and Mr. Hyde," 1886]
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repudiate (v.)

1540s, "to cast off by divorce," also general, "reject, refuse to accept" (a person or thing), from Latin repudiatus, past participle of repudiare "to cast off, put away, divorce, reject, scorn, disdain," from repudium "divorce, rejection, a putting away, dissolution of marriage," from re- "back, away" (see re-) + pudium.

This is probably is related to pudere "cause shame to," a verb of unknown etymology. Barnhart, however, suggests it is related to pes/ped- "foot," in which case the original notion may be of kicking something away.

In reference to persons, "to disown," 1690s. Of opinions, conduct, etc., "to refuse to acknowledge, reject with condemnation," attested from 1824. Of debts by 1837. Earliest in English as an adjective meaning "divorced, rejected, condemned" (mid-15c.), from Latin repudiatus. Related: Repudiated; repudiating; repudiable.

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scarlet (n.)

mid-13c., "rich cloth" (often, but not necessarily, bright red), from a shortened form of Old French escarlate "scarlet (color), top-quality fabric" (12c., Modern French écarlate), which, with Medieval Latin scarlatum "scarlet, cloth of scarlet," Italian scarlatto, Spanish escarlate often is said to be from a Middle Eastern source, but perhaps is rather from a Germanic source akin to Old High German scarlachen, scharlachen (c. 1200), from scar "sheared" + lachen "cloth."

In English as the name of a color, attested from late 14c. As an adjective from c. 1300. Scarlet lady, etc. (Isaiah i.18, Revelation xvii.1-5) is from notion of "red with shame or indignation." Scarlet fever is from 1670s, so called for its characteristic rash. Scarlet oak, a New World tree, attested from 1590s. Scarlet letter traces to Hawthorne's story (1850). German Scharlach, Dutch scharlaken show influence of words cognate with English lake (n.2).

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front (n.)
late 13c., "forehead," from Old French front "forehead, brow" (12c.), from Latin frontem (nominative frons) "forehead, brow, front; countenance, expression (especially as an indicator of truthfulness or shame); facade of a building, forepart; external appearance; vanguard, front rank," a word of "no plausible etymology" (de Vaan). Perhaps literally "that which projects," from PIE *bhront-, from root *bhren- "to project, stand out" (see brink). Or from PIE *ser- (4), "base of prepositions and preverbs with the basic meaning 'above, over, up, upper'" [Watkins, not in Pokorny].

Sense "foremost part of anything" emerged in the English word mid-14c.; sense of "the face as expressive of temper or character" is from late 14c. (hence frontless "shameless," c. 1600). The military sense of "foremost part of an army" (mid-14c.) led to the meaning "field of operations in contact with the enemy" (1660s); home front is from 1919. Meaning "organized body of political forces" is from 1926. Sense of "public facade" is from 1891; that of "something serving as a cover for illegal activities" is from 1905. Adverbial phrase in front is from 1610s. Meteorological sense first recorded 1921.
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sense (n.)

c. 1400, "faculty of perception," also "meaning, import, interpretation" (especially of Holy Scripture), from Old French sens "one of the five senses; meaning; wit, understanding" (12c.) and directly from Latin sensus "perception, feeling, undertaking, meaning," from sentire "perceive, feel, know," probably a figurative use of a literally meaning "to find one's way," or "to go mentally," from PIE root *sent- "to go" (source also of Old High German sinnan "to go, travel, strive after, have in mind, perceive," German Sinn "sense, mind," Old English sið "way, journey," Old Irish set, Welsh hynt "way"). Application to any one of the external or outward senses (touch, sight, hearing, etc.) in English first recorded 1520s.

A certain negro tribe has a special word for "see;" but only one general word for "hear," "touch," "smell," and "taste." It matters little through which sense I realize that in the dark I have blundered into a pig-sty. In French "sentir" means to smell, to touch, and to feel, all together. [Erich M. von Hornbostel, "Die Einheit der Sinne" ("The Unity of the Senses"), 1927]

Meaning "that which is wise" is from c. 1600. Meaning "capacity for perception and appreciation" is from c. 1600 (as in sense of humor, attested by 1783, sense of shame, 1640s).

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cum 

verb ("to ejaculate") and noun ("semen"), by 1973, apparently a variant of come in the sexual sense that originated in pornographic writing, perhaps first in the noun. This "experience sexual orgasm" slang meaning of come (perhaps originally come off) is attested by 1650, in "Walking In A Meadowe Greene," in a folio of "loose songs" collected by Bishop Percy.

They lay soe close together,
   they made me much to wonder;
I knew not which was wether,
   vntill I saw her vnder.
then off he came & blusht for shame
   soe soone that he had endit;
yet still shee lyes, & to him cryes,
   "Once More, & none can mend it."

It probably is older and disguised in puns, e.g. "I come, I come, sweet death, rock me a-sleep!" ["Nashe His Dildo," 1590s]

As a noun meaning "semen or other product of orgasm" come is attested by the 1920s.

The sexual cum seems to have no connection with Latin cum, the preposition meaning "with, together with, in connection with" (an archaic form of com; see com-) which English uses on occasion in names of combined parishes or benefices (such as Chorlton-cum-Hardy), in popular Latin phrases (such as cum laude), or as a combining word to indicate a dual nature or function (such as slumber party-cum-bloodbath).

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belittle (v.)

1781, "to make small, reduce in proportion," from be- + little (v.); first recorded in writings of Thomas Jefferson (and probably coined by him), Jefferson used it in "Notes on the State of Virginia" to characterize the view promoted as scientific by French naturalist Georges-Louis Leclerc Buffon that American species (including humans) were naturally smaller than and inferior to European ones, which Jefferson was at pains to refute. ("So far the Count de Buffon has carried this new theory of the tendency of nature to belittle her productions on this side of the Atlantic.") The word was roundly execrated in England, as be- is properly to be used only with verbs:

Belittle! What an expression! It may be an elegant one in Virginia, and even perfectly intelligible; but for our part, all we can do is to guess at its meaning. For shame, Mr. Jefferson! [European Magazine and London Review, August 1787; to guess was considered another Yankee barbarism]

Jefferson also sent Buffon a stuffed moose. The figurative sense of "depreciate, scorn as worthless" (as the reviewers did to this word) is from 1797 and is now almost the only sense. Related: Belittled; belittling.

Jefferson, as if disposed to assail the sovereignty of the English tongue as well as the sovereignty of the English sword, never hesitated to coin a word when it suited his purposes so to do; and though many of his brood are questionable on the ground of analogy and as intermixing languages; yet they were expressive, and became familiar. [Hugh Blair Grigsby, "The Virginia Convention of 1776," 1855]
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proof (n.)

c. 1200, preove "evidence and argumentation to establish the fact of (something) beyond reasonable doubt," from Anglo-French prove, preove, Old French proeve, prueve "proof, test, experience" (13c., Modern French preuve), from Late Latin proba "a proof," a back-formation from Latin probare "to prove" (see prove). "The devocalization of v to f ensued upon the loss of final e; cf. the relation of v and f in believe, belief, relieve, relief, behove, behoof, etc." [OED].

The meaning "act of proving" is early 14c. The meaning "act of testing or making trial of anything" is from late 14c., from influence of prove. Meaning "standard of strength of distilled liquor" is from 1705, on the notion of "having been tested as to degree of strength." The use in photography is from 1855. The typographical sense of "trial impression to test type" is from c. 1600. The numismatic sense of "coin struck to test a die" is from 1762; now mostly in reference to coins struck from highly polished dies, mainly for collectors.

The adjectival sense "impenetrable, able to resist" (as in proof against) is recorded from 1590s, from the noun in expressions such as proof of (mid-15c.), hence extended senses involving "of tested power against" in compounds such as fireproof (1630s), rust-proof (1690s), waterproof (1725), fool-proof (1902), etc. Shakespeare has shame-proof. Expression the proof is in the pudding (1915) is a curious perversion of earlier proof of the pudding shall be in the eating (1708), with proof in the sense "quality of proving good or turning out well" (17c.).

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