Burnish shares its root with "brown" and "brunette" — polished metal takes on a warm brownish sheen, linking color, light, and the metalworker's craft.
To polish metal or another hard surface by rubbing until it shines. Figuratively, to improve or enhance one's reputation or image.
From Old French burnir/brunir (to make brown, to polish), from brun (brown, shining), from Proto-Germanic *brūnaz (brown, shining) Key roots: *brūnaz (Proto-Germanic: "brown, shining"), brun (Old French: "brown, polished").
Burnish comes from the same Germanic root as "brown" and "brunette" — the connection is that polished metal takes on a warm, brownish sheen. The word made a round trip from Germanic (*brūnaz, "brown, shining") into Old French (brun, "brown") and back into English as burnish. Medieval armorers burnished steel to both beautify it and protect it from rust — the polishing compressed