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dope[dope 词源字典]

dope: [19] Dope originated in the USA, where it was borrowed from Dutch doop ‘sauce’. This was a derivative of the verb doopen ‘dip’, which is related to English dip. It was at first used as a general colloquialism for any thick semi-liquid preparation, whether used as a food or, for example, as a lubricant, but during the 19th century some specific strands began to emerge: notably ‘drug’, and in particular ‘opium’, and ‘varnish painted on the fabric of an aircraft’.

The effects of the former led to its use in the sense ‘fool’, and to the coinage of the adjective dopey, first recorded in the 1890s. The sense ‘information’ dates from around 1900.
=> deep, dip[dope etymology, dope origin, 英语词源]