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demagogue [demagogue 词源字典]: demagogue: [17] A demagogue is literally a ‘leader of the people’. The word represents Greek demagōgós, a compound formed from demos ‘common people’ and agōgós ‘leader’. (This was derived from ágein ‘drive, lead’, a verb related to Latin agere ‘do’, and hence to its host of English descendants, from act to prodigal.) In ancient Greece the term was applied particularly to a set of unofficial leaders drawn from the common people who controlled the government of Athens in the 4th century BC, and whose irresponsible rule (as their critics saw it) has given demagogue a bad name ever since.
=> act, agent[demagogue etymology, demagogue 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]
demagogue (n.): 1640s, from Greek demagogos "popular leader," also "leader of the mob," from demos "people" (see demotic) + agogos "leader," from agein "to lead" (see act (n.)). Often a term of disparagement since the time of its first use, in Athens, 5c. B.C.E. Form perhaps influenced by French demagogue (mid-14c.).
hypnagogic (adj.): 1868, from French hypnagogique, from Greek hypnos "sleep" (see somnolence) + agogos "leading" (see act). Etymologically, "inducing sleep," but used mostly with a sense "pertaining to the state of consciousness when falling asleep."
mystagogue (n.): "person who initiates into mysteries," 1550s, from Latin mystagogus "a guide to the mysteries," from Greek mystagogos, from mystes "one initiated into the mysteries" (see mystery (n.1)) + agogos "leading, a leader" (see act (n.)). Related: Mystagogic; mystagogical; mystagogy; mystagoguery.
ochlocracy (n.): "government by the rabble," 1580s, from French ochlocratie (1560s), from Greek okhlokratia (Polybius) "mob rule," the lowest grade of democracy, from kratos "rule, power, strength" (see -cracy) + okhlos "mob, populace," perhaps literally "moving mass," from PIE *wogh-lo-, from root *wegh- "to go, transport" in a vehicle (see weigh). For sense development, compare mob (n.). Related: Ochlocratic; ochlocratical. Greek also had okhlagogos "mob-leader, ochlagogue."
pedagogic (adj.): 1781, from Latin paedagogicus, from Greek paidagogikos "suitable for a teacher," from paidagogos "teacher" (see pedagogue).
pedagogue (n.): late 14c., "schoolmaster, teacher," from Old French pedagoge "teacher of children" (14c.), from Latin paedagogus, from Greek paidagogos "slave who escorts boys to school and generally supervises them," later "a teacher," from pais (genitive paidos) "child" (see pedo-) + agogos "leader," from agein "to lead" (see act (n.)). Hostile implications in the word are at least from the time of Pepys (1650s). Related: Pedagogal.
pedagogy (n.): 1580s, from Middle French pédagogie (16c.), from Latin paedagogia, from Greek paidagogia "education, attendance on boys," from paidagogos "teacher" (see pedagogue).
galactagogue: "A food or drug that promotes or increases the flow of a mother’s milk", Mid 19th century: from Greek gala, galakt- 'milk' + agōgos 'leading'.
emmenagogue: "A substance that stimulates or increases menstrual flow", Early 18th century: from Greek emmēna 'menses' + agōgos 'eliciting'.
agogic: "Relating to or denoting accentuation within musical phrases by slight lengthening of notes", Late 19th century: coined in German from Greek agōgos 'leading', from agein 'to lead', + -ic.