upsiden.
英 'ʌpsaɪd | 美 'ʌpsaɪd
中文n. 上部；上面；上边
词根词源
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, U.S. black slang.
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