acrosticyoudaoicibaDictYouDict[acrostic 词源字典]
acrostic: [16] An acrostic is a piece of verse in which the first letters of each line when put together spell out a word. The term is of Greek origin (akrostikhis), and was formed from ákros ‘at the extremity’ (see ACROBAT) and stíkhos ‘line of verse’. The second element crops up in several other prosodic terms, such as distich and hemistich, and comes from the Greek verb steíkhein ‘go’, which is related ultimately to English stair, stile, and stirrup.
=> acrobat, distich, hemistich, stair, stile, stirrup[acrostic etymology, acrostic origin, 英语词源]
bingo (n.)youdaoicibaDictYouDict
lotto-like game of chance, 1936; many theories about its origin, none satisfying; the most likely is bingo! as an exclamation of sudden realization or surprise (attested from 1923). Uncertain connection to the slang word for "brandy" (1690s); attested as "liquor" in American English, 1861. Thomas Chandler Haliburton ("Sam Slick") in "The Americans at Home" (1854) recounts a story of a drinking game in which the children's song about the farmer's dog was sung and when it came time to spell out the name, every participant had to take a letter in turn, and anyone who missed or flubbed had to drink.
spell (v.1)youdaoicibaDictYouDict
early 14c., "read letter by letter, write or say the letters of;" c. 1400, "form words by means of letters," apparently a French word that merged with or displaced a native Old English one; both are from the same Germanic root, but the French word had evolved a different sense. The native word is Old English spellian "to tell, speak, discourse, talk," from Proto-Germanic *spellam (cognates: Old High German spellon "to tell," Old Norse spjalla, Gothic spillon "to talk, tell"), from PIE *spel- (2) "to say aloud, recite."

But the current senses seem to come from Anglo-French espeller, Old French espelir "mean, signify, explain, interpret," also "spell out letters, pronounce, recite," from Frankish *spellon "to tell" or some other Germanic source, ultimately identical with the native word.

Related: Spelled; spelling. In early Middle English still "to speak, preach, talk, tell," hence such expressions as hear spell "hear (something) told or talked about," spell the wind "talk in vain" (both 15c.). Meaning "form words with proper letters" is from 1580s. Spell out "explain step-by-step" is first recorded 1940, American English. Shakespeare has spell (someone) backwards "reverse the character of, explain in a contrary sense, portray with determined negativity."