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open[open 词源字典]

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 etymology, open origin, 英语词源]