This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The modern form combines 木 (tree/wood) with 㕑, but the original function of this compound is unclear.
The kanji visually contains 木 (tree) beside 㕑, but without a clear meaning, it is best remembered as an uncommon wood-related shape.
For チュ, imagine a rare wooden chest (ひつ) with a chew mark on it: chew -> チュ, tying the on-reading to the kun-reading image.