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sing-song (adj.)
[sing-song 词源字典]
also
singsong
, musically repetitive and unvarying, 1734, from earlier use as a noun meaning "a jingling ballad" (c. 1600), from
sing
(v.) +
song
(n.).
[sing-song etymology, sing-song origin, 英语词源]
[sing-song 词源字典]