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approve [approve 词源字典]: approve: [14] The Latin source of approve, approbāre, was a derivative of probāre, source of English prove. Probāre originally meant ‘test something to find if it is good’ (it was based on Latin probus ‘good’) and this became extended to ‘show something to be good or valid’. It was this sense that was taken up by approbāre and carried further to ‘assent to as good’. When English acquired the word, via Old French aprover, it still carried the notion of ‘demonstrating’, but this was gradually taken over exclusively by prove, and the senses ‘sanction’ and ‘commend’, present since the beginning, established their primacy.
=> probity, prove[approve etymology, approve origin, 英语词源]
demonstrate (v.): 1550s, "to point out," from Latin demonstratus, past participle of demonstrare (see demonstration). Meaning "to point out by argument or deduction" is from 1570s. Related: Demonstrated; demonstrating.
demonstrative (adj.): late 14c., "characterized by logic, based on logic," from Old French démonstratif (14c.), from Latin demonstrativus "pointing out, demonstrating," from past participle stem of demonstrare (see demonstration). Grammatical sense, "pointing out the thing referred to," is mid-15c. Meaning "given to outward expressions of feelings" is from 1819. Demonstrative pronoun is late 16c.
fire (n.): Old English fyr "fire, a fire," from Proto-Germanic *fur-i- (cognates: Old Saxon fiur, Old Frisian fiur, Old Norse fürr, Middle Dutch and Dutch vuur, Old High German fiur, German Feuer "fire"), from PIE *perjos, from root *paəwr- "fire" (cognates: Armenian hur "fire, torch," Czech pyr "hot ashes," Greek pyr, Umbrian pir, Sanskrit pu, Hittite pahhur "fire"). Current spelling is attested as early as 1200, but did not fully displace Middle English fier (preserved in fiery) until c. 1600.

PIE apparently had two roots for fire: *paewr- and *egni- (source of Latin ignis). The former was "inanimate," referring to fire as a substance, and the latter was "animate," referring to it as a living force (compare water (n.1)).
Brend child fuir fordredeþ ["The Proverbs of Hendyng," c. 1250]
English fire was applied to "ardent, burning" passions or feelings from mid-14c. Meaning "discharge of firearms, action of guns, etc." is from 1580s. To be on fire is from c. 1500 (in fire attested from c. 1400, as is on a flame "on fire"). To play with fire in the figurative sense "risk disaster, meddle carelessly or ignorantly with a dangerous matter" is by 1861, from the common warning to children. Phrase where's the fire?, said to one in an obvious hurry, is by 1917, American English.

Fire-bell is from 1620s; fire-alarm as a self-acting, mechanical device is from 1808 as a theoretical creation; practical versions began to appear in the early 1830s. Fire-escape (n.) is from 1788 (the original so-called was a sort of rope-ladder disguised as a small settee); fire-extinguisher is from 1826. A fire-bucket (1580s) carries water to a fire. Fire-house is from 1899; fire-hall from 1867, fire-station from 1828. Fire company "men for managing a fire-engine" is from 1744, American English. Fire brigade "firefighters organized in a body in a particular place" is from 1838. Fire department, usually a branch of local government, is from 1805. Fire-chief is from 1877; fire-ranger from 1909.

Symbolic fire and the sword is by c. 1600 (translating Latin flamma ferroque absumi); earlier yron and fyre (1560s), with suerd & flawme (mid-15c.), mid fure & mid here ("with fire and armed force"), c. 1200. Fire-breathing is from 1590s. To set the river on fire, "accomplish something surprising or remarkable" (usually with a negative and said of one considered foolish or incompetent) is by 1830, often with the name of a river, varying according to locality, but the original is set the Thames on fire (1796). The hypothetical feat was mentioned as the type of something impossibly difficult by 1720; it circulated as a theoretical possibility under some current models of chemistry c. 1792-95, which may have contributed to the rise of the expression.
[A]mong other fanciful modes of demonstrating the practicability of conducting the gas wherever it might be required, he anchored a small boat in the stream about 50 yards from the shore, to which he conveyed a pipe, having the end turned up so as to rise above the water, and forcing the gas through the pipe, lighted it just above the surface, observing to his friends "that he had now set the river on fire." ["On the Origins and Progress of Gas-lighting," in "Repertory of Patent Inventions," vol. III, London, 1827]
lulu (n.): "remarkable person or thing," 1886 (first attested in a baseball article from New Orleans, U.S.), of uncertain origin; some suggest a connection to earlier looly "beautiful girl," of unknown origin. But the reference more likely is to Lulu Hurst (1869-1950), the "Georgia Wonder," who was a popular attraction 1883-85 demonstrating her supposed mysterious "force" that allowed her to effortlessly move, with just a light touch, umbrellas and canes held tight by others. She barnstormed the U.S. and, at 15, was, briefly, one of the most famous women in the land. The skeptics soon explained her trick and burst the bubble, but not before her name was used as a word:
Such [musically uneducated persons] start from the avowed or unavowed supposition that the pianist or violinist's art necessitates no higher qualities than does plate-spinning, dancing, or the feats of a Lulu. ["The Hero as Virtuoso," in "London Society magazine," 1883]