upyoudaoicibaDictYouDict[up 词源字典]
up: [OE] Up is part of a widespread family of Germanic adverbs which also includes German auf, Dutch and Danish op, and Swedish upp. It goes back ultimately to Indo-European *up-, which also produced English over and the prefixes hyper- and super- and may lie behind English evil. To open something is etymologically to put it ‘up’.
=> open, over[up etymology, up origin, 英语词源]
up (adv.)youdaoicibaDictYouDict
Old English up, uppe, from Proto-Germanic *upp- "up" (cognates: Old Frisian, Old Saxon up "up, upward," Old Norse upp; Danish, Dutch op; Old High German uf, German auf "up"; Gothic iup "up, upward," uf "on, upon, under;" Old High German oba, German ob "over, above, on, upon"), from PIE root *upo "up from below" (cognates: Sanskrit upa "near, under, up to, on," Greek hypo "under, below," Latin sub "under;" see sub-).

As a preposition, "to a higher place" from c. 1500; also "along, through" (1510s), "toward" (1590s). Often used elliptically for go up, come up, rise up, etc. Up the river "in jail" first recorded 1891, originally in reference to Sing Sing, which is up the Hudson from New York City. To drive someone up the wall (1951) is from the notion of the behavior of lunatics or caged animals. Insulting retort up yours (scil. ass) attested by late 19c.
up (v.)youdaoicibaDictYouDict
1550s, "to drive and catch (swans)," from up (adv.). Intransitive meaning "get up, rise to one's feet" (as in up and leave) is recorded from 1640s. Sense of "to move upward" is recorded from 1737. Meaning "increase" (as in up the price of oil) is attested from 1915. Compare Old English verb uppian "to rise up, swell." Related: Upped; upping. Upping block is attested from 1796.
up (n.)youdaoicibaDictYouDict
"that which is up," 1530s, from up (adv.). Phrase on the up-(and-up) "honest, straightforward" first attested 1863, American English.
up (adj.)youdaoicibaDictYouDict
c. 1300, "dwelling inland or upland," from up (adv.). Meaning "going up" is from 1784. From 1815 as "excited, exhilarated, happy," hence "enthusiastic, optimistic." Up-and-coming "promising" is from 1848. Musical up-tempo (adj.) is recorded from 1948.