英语词源字典 - 在线词源网站

dance [dance 词源字典]: dance: [13] The history of the word dance, now widespread amongst European languages (French dansir, Spanish danzar, Italian danzare, German tanzen, Swedish dansa, Russian tancovat’), is disappointingly obscure. All these forms, including the English word, stem from an original Old French danser. This developed from an assumed Vulgar Latin *dansāre, which may have been borrowed from a Frankish *dintjan (Frisian dintje ‘tremble’ has been compared).
[dance etymology, dance origin, 英语词源]
disappoint (v.): early 15c., "dispossess of appointed office," from Middle French desappointer (14c.) "undo the appointment, remove from office," from des- (see dis-) + appointer "appoint" (see appoint).

Modern sense of "to frustrate expectations" (late 15c.) is from secondary meaning of "fail to keep an appointment." Related: Disappointed; disappointing.
disappointment (n.): 1610s, "fact of disappointing;" see disappoint + -ment. Meaning "state or feeling of being disappointed" is from 1756. Meaning "a thing that disappoints" is from 1756.
non-event (n.): "unimportant or disappointing event," 1962, from non- + event.
wash-out (n.): also washout, 1877, "act of washing out" (a drain, etc.), from verbal phrase; see wash (v.) + out (adv.). From 1873 as "excavation of a roadbed, etc., by erosion" is from 1873. Meaning "a disappointing failure" is from 1902, from verbal phrase wash out "obliterate, cancel" (something written in ink), attested from 1570s. Hence also the colloquial sense of "to call off (an event) due to bad weather, etc." (1917). Of colored material, washed-out "faded" is from 1837.
Barmecide: "Illusory or imaginary and therefore disappointing", Early 18th century (as a noun): from Arabic Barmakī, the name of a prince in the Arabian Nights' Entertainments, who gave a beggar a feast consisting of ornate but empty dishes.