• adv. 起来；上涨；向上
• prep. 在…之上；向…的较高处
• adj. 涨的；起床的；向上的
• n. 上升；繁荣

来自PIE*upo, 在下面，从下往上，向上，词源同sub-, over.

up

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 (adv.)

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.)

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.)

"that which is up," 1530s, from up (adv.). Phrase on the up-(and-up) "honest, straightforward" first attested 1863, American English.

up (adj.)

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.

1. When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.

当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。

来自

2. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.

当你从内心深处找到一种可以忍受一切痛苦的坚强力量时，你的成长历程就会出现飞跃。

来自金山词霸 每日一句

3. He finished his conversation and stood up, looking straight at me.

他说完话站起来，直视着我。

来自柯林斯例句

4. These files have been zipped up to take up less disk space.

这些文档已经进行了压缩，以节省磁盘空间。

来自柯林斯例句

5. He was fired from his job after roughing up a colleague.

他因为对一位同事动粗而被开除了。

来自柯林斯例句