blind (adj.)youdaoicibaDictYouDict[blind 词源字典]
Old English blind "blind," also "dark, enveloped in darkness, obscure; unintelligent, lacking mental perception," probably from Proto-Germanic *blinda- "blind" (cognates: Dutch and German blind, Old Norse blindr, Gothic blinds "blind"), perhaps, via notion of "to make cloudy, deceive," from an extended Germanic form of the PIE root *bhel- (1) "to shine, flash, burn" (see bleach (v.)). Compare Lithuanian blendzas "blind," blesti "to become dark." The original sense would be not "sightless" but rather "confused," which perhaps underlies such phrases as blind alley (Chaucer's lanes blynde), which is older than the sense of "closed at one end" (1610s).
The twilight, or rather the hour between the time when one can no longer see to read and the lighting of the candles, is commonly called blindman's holiday. [Grose, 1796]
In reference to doing something without seeing it first, by 1840. Of aviators flying without instruments or without clear observation, from 1919. Related: Blinded; blinding. Blindman's bluff is from 1580s.[blind etymology, blind origin, 英语词源]
fend (v.)youdaoicibaDictYouDict
c. 1300, "defend, guard; protect; put up a fight; excuse or justify; forbid, bar," shortening of defend. From mid-14c. as "make a defense" and (usually with off (adv.)) "ward off, beat off, keep at a distance." Developed a meaning "make provision, give care" in Scottish English (16c.); hence to fend for oneself (1620s) "see to one's own defense." Related: Fended; fending.
hum (v.)youdaoicibaDictYouDict
late 14c., hommen "make a murmuring sound to cover embarrassment," later hummen "to buzz, drone" (early 15c.), probably of imitative origin. Sense of "sing with closed lips" is first attested late 15c.; that of "be busy and active" is 1884, perhaps on analogy of a beehive. Related: Hummed; humming. Humming-bird (1630s) so called from sound made by the rapid vibration of its wings.
There is a curious bird to see to, called a humming bird, no bigger then a great Beetle. [Thomas Morton, "New English Canaan," 1637]
polish (v.)youdaoicibaDictYouDict
early 14c., polischen "make smooth," from Old French poliss-, present participle stem of polir (12c.) "to polish, decorate, see to one's appearance," from Latin polire "to polish, make smooth; decorate, embellish;" figuratively "refine, improve," said to be from Proto-Indo-European *pel- "to thrust, strike, drive" (via the notion of fulling cloth). The sense of "free from coarseness, to refine" first recorded in English mid-14c. Related: Polished; polishing. Slang polish off "finish" is 1837, from notion of applying a coat of polish being the final step in a piece of work.
wait (v.)youdaoicibaDictYouDict
c. 1200, "to watch with hostile intent, lie in wait for, plot against," from Anglo-French and Old North French waitier "to watch" (Old French gaitier "defend, watch out, be on one's guard; lie in wait for;" Modern French guetter), from Frankish *wahton or another Germanic source, from Proto-Germanic *waht- (cognates: Dutch wacht "a watching," Old High German wahten, German wachten "to watch, to guard;" Old High German wahhon "to watch, be awake," Old English wacian "to be awake;" see wake (v.)). General sense of "remain in some place" is from late 14c.; that of "to see to it that something occurs" is late 14c. Meaning "to stand by in attendance on" is late 14c.; specific sense of "serve as an attendant at a table" is from 1560s. Related: Waited; waiting.

To wait (something) out "endure a period of waiting" is recorded from 1849. Waiting room is attested from 1680s. Waiting list is recorded from 1841; the verb wait-list "to put (someone) on a waiting list" is recorded from 1960. Waiting game is recorded from 1835, originally in horse-racing.
When speed, not stoutness, is the best of a horse, quite a contrary system is practised. With such a horse, the jockey plays a waiting game; that is, he carefully nurses him through the race, so as not to distress him by overpacing him; as the finish approaches, he creeps up to his horses by degrees, but does not quit them to go in front till he sees that the pace has made them "safe," -- when he lets loose and wins. [James Christie Whyte, "History of the British Turf," London, 1840]