This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 窋 is uncertain. It visually combines 穴 (hole, cave) and 出 (exit, come out), but the original semantic and phonetic roles are unclear.
With 穴 (hole) over 出 (exit), imagine something emerging from a hole or cave, but since the meaning is uncertain, treat this as a visual hint only.
For チュツ, use the invented hook 'chew-tsu': picture chewing on a tough root while trying to pull it out of a hole (穴 + 出). Chew-tsu -> チュツ.
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