• adj. 公开的；敞开的；空旷的；坦率的；营业着的
• vi. 开始；展现
• vt. 公开；打开
• n. 公开；空旷；户外

来自古英语open,打开，升起，来自Proto-Germanic*upana,向上，竖立，来自PIE*upo,向上，词源同up,over.

open

open: [OE] Etymologically, open means ‘turned up’ or ‘put up’. It comes ultimately from a prehistoric Germanic *upanaz, an adjective based on the ancestor of up, and therefore presumably denoted originally the raising of a lid or cover. The German verb aufmachen ‘open’, literally ‘make up’, contains the adverb auf, the German equivalent to English up. The English verb open [OE] is a derivative of the adjective.
=> up

open (adj.)

Old English open "not closed down, raised up" (of gates, eyelids, etc.), also "exposed, evident, well-known, public," often in a bad sense, "notorious, shameless;" from Proto-Germanic *upana, literally "put or set up" (cognates: Old Norse opinn, Swedish ?ppen, Danish aaben, Old Saxon opan, Old Frisian epen, Old High German offan, German offen "open"), from PIE *upo "up from under, over" (cognates: Latin sub, Greek hypo; see sub-). Related to up, and throughout Germanic the word has the appearance of a past participle of *up (v.), but no such verb has been found. The source of words for "open" in many Indo-European languages seems to be an opposite of the word for "closed, shut" (such as Gothic uslukan).

Of physical spaces, "unobstructed, unencumbered," c. 1200; of rooms with unclosed entrances, c. 1300; of wounds, late 14c. Transferred sense of "frank, candid" is attested from early 14c. Of shops, etc., "available for business," it dates from 1824. Open door in reference to international trading policies is attested from 1856. Open season is first recorded 1896, of game; and figuratively 1914 of persons. Open book in the figurative sense of "person easy to understand" is from 1853. Open house "hospitality for all visitors" is first recorded 1824. Open-and-shut "simple, straightforward" first recorded 1841 in New Orleans. Open marriage, one in which the partners sleep with whomever they please, is from 1972. Open road (1817, American English) originally meant a public one; romanticized sense of "traveling as an expression of personal freedom" first recorded 1856, in Whitman.

open (n.)

early 13c., "an aperture or opening," from open (adj.). Meaning "public knowledge" (especially in out in the open) is from 1942, but compare Middle English in open (late 14c.) "manifestly, publicly." The sense of "an open competition" is from 1926, originally in a golf context.

open (v.)

Old English openian "to open, open up, disclose, reveal," also intransitive, "become manifest, be open to or exposed to," from Proto-Germanic *opanojan (cognates: Old Saxon opanon, Old Norse opna "to open," Middle Dutch, Dutch openen, Old High German offanon, German ?ffnen), from the source of open (adj.), but etymology suggests the adjective is older. Open up "cease to be secretive" is from 1921. Related: Opened; opening.

1. The action is an open violation of the Vienna Convention.

该行为公然违背了《维也纳公约》。

来自柯林斯例句

2. Without warning, Bardo smacked his fist into his open hand.

巴多没有任何预兆地一拳砸在自己摊开的手掌上.

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3. It's an open secret that the security service bugged telephones.

安全部门窃听电话是人人皆知的秘密。

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4. In 1973, the first Open University graduates received their degrees.

1973年，第一批开放大学的毕业生获得了学位。

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5. Don't leave a child alone in a room with an open fire.

房间里有裸露的明火时，不要让孩子独处其中。

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