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sky [sky 词源字典]: sky: [13] Our Anglo-Saxon ancestors called the sky heofon ‘heaven’. Not until the early Middle English period did heaven begin to be pushed aside by sky, a borrowing from Old Norse ský ‘cloud’. This came ultimately from an Indo- European base meaning ‘cover’, which also produced Latin obscūrus, source of English obscure [14]. (For a while English continued to use sky for ‘cloud’ as well as for ‘sky’: the medieval Scots poet William Dunbar wrote, ‘When sable all the heaven arrays with misty vapours, clouds, and skies’.)
=> obscure[sky etymology, sky origin, 英语词源]
chiaroscuro (n.): 1680s, "disposition of light and dark in a picture," literally "bright-dark," from Italian chiaro "clear, bright" (from Latin clarus; see clear (adj.)) + oscuro (from Latin obscurus; see obscure (adj.)). Related: Chiaroscurist.
obscure (adj.): c. 1400, "dark," figuratively "morally unenlightened; gloomy," from Old French obscur, oscur "dark, clouded, gloomy; dim, not clear" (12c.) and directly from Latin obscurus "dark, dusky, shady," figuratively "unknown; unintelligible; hard to discern; from insignificant ancestors," from ob "over" (see ob-) + -scurus "covered," from PIE *(s)keu- "to cover, conceal" (see sky). Related: Obscurely.
obscure (v.): early 15c., "to cover (something), cloud over," from obscure (adj.) or else from Middle French obscurer, from Latin obscurare "to make dark, darken, obscure," from obscurus. Related: Obscured; obscuring.
obscurity (n.): late 15c., "absence of light;" 1610s with meaning "condition of being unknown;" from obscure (adj.) + -ity; or else from Middle French obscurité, variant of Old French oscureté "darkness, gloom; vagueness, confusion; insignificance" (14c.), from Latin obscuritatem (nominative obscuritas) "darkness, indistinctness, uncertainty," from obscurus.