This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 荕 is uncertain. It visually combines 艹 (grass) with 肋 (rib), but this may not reflect its original formation.
With no clear meaning, picture grass 艹 growing over ribs 肋, perhaps suggesting something hidden or obscure.
For キン, imagine a kin (family) member examining the grass-covered ribs: kin -> キン, though the meaning remains unclear.