英语词源字典 - 在线词源网站

red-blooded (adj.)[red-blooded 词源字典]: "having red blood," 1802, from red (adj.1) + blood (n.). Figurative meaning "vigorous, spirited" is recorded from 1877.[red-blooded etymology, red-blooded origin, 英语词源]
red-eye (n.): "airplane flight which deprives travelers of sleep," 1968, from the red eyes of sleeplessness; earlier as a noun meaning "raw and inferior whiskey" (1819, American English).
red-handed (adj.): 1781, earlier red-hand (early 15c.), originally in Scottish legal writing, from red (adj.1) + -handed; presumably from the image of a murderer with hands still stained with blood.
red-hot (adj.): late 14c., "heated till it glows red" (of metal, etc.); of persons, "lively, passionate," it is recorded from c. 1600. Red-hot mama is 1926, jazz slang, "earthy female singer," also "girlfriend, lover."
red-streak (n.): type of apple prized for cider-making, 1660s, from red (adj.1) + streak (n.).