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upside down (adv.)
[upside down 词源字典]
late 15c., earlier
upsadoun
(late 14c.),
up so down
(c. 1300); the
so
perhaps meaning "as if." As an adjective from 1866.
[upside down etymology, upside down origin, 英语词源]
[upside down 词源字典]