This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The character combines 喬 and 力, but its original meaning and formation are not well documented.
No clear meaning is available, so a mnemonic cannot be reliably constructed.
For キャク, imagine a character named Kyaku who is strong like 力 and tall like 喬: Kyaku -> キャク.