plating, gilding
鍍 centers on applying a thin metal coating to a surface: plating or gilding an object with a metallic layer.
鍍 combines 金 (metal) with 度, which likely contributes the sound and may relate to the idea of applying or measuring a layer.
The metal radical 金 on the left and 度 on the right suggest measuring out a metal coating: imagine dipping an object into molten gold to plate it evenly.
For ト, picture a toe being dipped in gold plating: toe -> ト, and the metal coats the toe.