This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
銸 combines 金 (metal) with 耴, but the exact historical development is uncertain. It may have been a specialized character for a metal tool or implement, but no clear origin is established.
The left side 金 suggests metal, and the right side 耴 looks like an ear 耳 with a hook 乙. Picture a metal tool shaped like an ear with a hook, perhaps a pair of scissors or tweezers, though its exact meaning is unclear.
For チョウ, imagine a metal tool named Chou: Chou -> チョウ, a made-up name for this obscure metal implement.