fadeyoudaoicibaDictYouDict[fade 词源字典]
fade: [14] Fade comes from Old French fader, a derivative of the adjective fade ‘faded, vapid’. This in turn came from Vulgar Latin *fatidus, which probably represents an alteration of Latin fatuus ‘stupid, insipid’ (source of English fatuous [17]) under the influence of Latin vapidus ‘flat, lifeless’ (source of English vapid).
=> fatuous, vapid[fade etymology, fade origin, 英语词源]
fade (v.)youdaoicibaDictYouDict
early 14c., "lose brightness, grow pale," from Old French fader "become weak, wilt, wither," from fade (adj.) "pale, weak; insipid, tasteless" (12c.), probably from Vulgar Latin *fatidus, which is said to be a blending of Latin fatuus "silly, tasteless" and vapidus "flat, flavorless." Related: Faded; fading. Of sounds, by 1819. Transitive sense from 1590s; in cinematography from 1918.
Adieu! adieu! thy plaintive anthem fades
Past the near meadows, over the still stream,
Up the hill-side; and now 'tis buried deep
In the next valley-glades:
Was it a vision, or a waking dream?
Fled is that music:--Do I wake or sleep?

[Keats, "Ode to a Nightingale"]
fade (n.)youdaoicibaDictYouDict
early 14c., "loss of freshness or vigor," from fade (adj.), c. 1300, " lacking in brilliance; pale, discolored, dull," from Old French fade (see fade (v.)). As a type of tapering hairstyle from 1988 (fade-out style is in a 1985 "Ebony" article on men's haircuts).