This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鍯 is a rare character combining 金 (metal) with 怱, which likely contributes the sound. The exact historical development is uncertain.
With no clear meaning, picture a mysterious metal object (金) combined with a hurried heart (怱) — perhaps a forgotten tool made in haste.
For ソウ, imagine the sound of metal (金) clanging in a hurried workshop: the clang echoes 'sou' (ソウ) as the smith works quickly.