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bully [bully 词源字典]: bully: [16] Bullies have undergone a sad decline in status. In the 16th century the word meant ‘sweetheart’: ‘Though she be somewhat old, it is my own sweet bully’, John Bale, Three laws 1538. But gradually the rot set in, its meaning passing through ‘fine fellow’ to ‘blusterer’ to the present-day harasser of inferiors. In the 18th and 19th centuries it also meant ‘pimp’.

It is probably a modification of Dutch boele ‘lover’ which, as a term of endearment, may have originated as baby-talk. This bully has no connection with the bully of bully beef [18], which comes from French bouilli, the past participle of bouillir ‘boil’. The bully of bully off [19], a now discontinued way of starting play in hockey, appears to come from a term for ‘scrummage’ in Eton football, but whether that is related to the cruel bully is not clear.
[bully etymology, bully origin, 英语词源]
civil (adj.): late 14c., "relating to civil law or life; pertaining to the internal affairs of a state," from Old French civil "civil, relating to civil law" (13c.) and directly from Latin civilis "relating to a citizen, relating to public life, befitting a citizen," hence by extension "popular, affable, courteous;" alternative adjectival derivation of civis "townsman" (see city).

The sense of "polite" was in classical Latin, from the courteous manners of citizens, as opposed to those of soldiers. But English did not pick up this nuance of the word until late 16c. "Courteous is thus more commonly said of superiors, civil of inferiors, since it implies or suggests the possibility of incivility or rudeness" [OED]. Civil case (as opposed to criminal) is recorded from 1610s. Civil liberty is by 1640s. Civil service is from 1772, originally in reference to the East India Company.
condescend (adj.): mid-14c., "to yield deferentially," from Old French condescendere (14c.) "to agree, consent, give in, yield," from Late Latin condescendere "to let oneself down," from Latin com- "together" (see com-) + descendere "descend" (see descend). Sense of "to sink willingly to equal terms with inferiors" is from mid-15c.
thou (pron.): 2nd nominative singular personal pronoun, Old English þu, from Proto-Germanic *thu (cognates: Old Frisian thu, Middle Dutch and Middle Low German du, Old High German and German du, Old Norse þu, Gothic þu), from PIE *tu-, second person singular pronoun (cognates: Latin tu, Irish tu, Welsh ti, Greek su, Lithuanian tu, Old Church Slavonic ty, Sanskrit twa-m).

Superseded in Middle English by plural form you (from a different root), but retained in certain dialects (e.g. early Quakers). The plural at first was used in addressing superior individuals, later also (to err on the side of propriety) strangers, and ultimately all equals. By c. 1450 the use of thou to address inferiors gave it a tinge of insult unless addressed by parents to children, or intimates to one another. Hence the verb meaning "to use 'thou' to a person" (mid-15c.).
Avaunt, caitiff, dost thou thou me! I am come of good kin, I tell thee! ["Hickscorner," c. 1530]
A brief history of the second person pronoun in English can be found here.
truckle (v.): "give up or submit tamely," 1610s, originally "sleep in a truckle bed" (see truckle (n.)). Meaning "give precedence, assume a submissive position" (1650s, implied in truckling) is perhaps in reference to that type of bed being used by servants and inferiors or simply occupying the lower position. Related: Truckled; truckling.
worser (adj.): double comparative; see worse + -er (2). Attested from late 15c. and common 16c.-17c. Noun worsers "(one's) inferiors" is from 1580s.