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brass[brass 词源字典]

brass: [OE] Related forms occur in one or two other Germanic languages (such as Middle Low German bras, which meant simply ‘metal’), but essentially brass is a mystery word, of unknown ancestry. Its association with ‘effrontery’ begins in the late 16th century, prefigured by Shakespeare’s ‘face of brass’ in Love’s Labours Lost 1580, and by the first instances of the use of the derived adjective brazen to mean ‘shameless’ (the underlying notion is probably of a face as hard as brass, and therefore unable to show shame). Brass ‘high-ranking people’, as in top brass, comes from brass hat [19], a derogatory slang term for a senior military officer with golden insignia on his cap.
[brass etymology, brass origin, 英语词源]