cap
錔 centers on a metal cap or covering that wraps around something, like a protective metal sleeve or lid.
錔 combines 金 (metal) with 沓, which likely contributes the sound and the idea of overlapping or covering, suggesting a metal cap.
The left side 金 means metal, and the right side 沓 looks like something layered or overlapping. Imagine a metal cap that fits snugly over the end of a pipe, wrapping around it.
For トウ, picture a metal cap on a toe of a giant statue: toe -> トウ, and the metal cap protects the toe.