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upside (n.)

1610s, "upper side or surface," from up (adj.) + side (n.). Adverbial phrase upside (someone's) head in reference to a blow to the head is recorded from 1970, African-American vernacular.

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Definitions of upside from WordNet

upside (n.)
the highest or uppermost side of anything;
Synonyms: top / top side / upper side
From wordnet.princeton.edu