/ ˈbɜːnɪʃ; NAmE ˈbɜːrnɪʃ/ verb
[ vn ] ( formal ) to polish metal until it is smooth and shiny
► bur·nished adjective [ usually before noun ]:
burnished gold / copper
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WORD ORIGIN
Middle English : from Old French burniss- , lengthened stem of burnir , variant of brunir make brown, from brun brown.