This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
桱 is a rare character combining 木 (tree/wood) with 巠, which may have contributed sound. The exact historical development is uncertain.
With 木 on the left and 巠 on the right, 桱 looks like a wooden object related to the sound ケイ or キョウ, but its meaning is unclear. Imagine a mysterious wooden tool whose name has been lost.
For ケイ, picture a wooden key (ケイ) carved from the tree 木 on the left, unlocking the unknown meaning of 桱.