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upside down (adv.)

late 15c., earlier upsadoun (late 14c.), up so down (c. 1300); the so perhaps meaning "as if." As an adjective from 1866.

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Definitions of upside down from WordNet

upside down (adv.)
in an inverted manner;
the box was lying on the floor upside down
From wordnet.princeton.edu

Dictionary Entries near upside down

uproot

upscale

upset

upshot

upside

upside down

upsilon

upskirt

upstage

upstairs

upstanding