This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鋥 combines 金 (metal) with 呈, which likely contributes the sound. The exact historical development is uncertain.
The left side is metal 金, and the right side 呈 looks like a display. Imagine a polished metal surface so shiny it displays a reflection, hinting at the idea of polishing or sharpening.
For トウ, imagine polishing a metal toe cap until it gleams: toe -> トウ, and the metal 金 shines after polishing.