This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 憗 is uncertain. It visually contains 心 at the bottom, suggesting a possible connection to mental or emotional states, but the origin of the upper components is unclear.
With 心 at the bottom, 憗 might relate to a state of mind, but its meaning is too obscure for a reliable mnemonic.
For キン, imagine a king (キン) pondering the mysterious kanji 憗, but even the king cannot guess its meaning.