This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
苚 combines the grass radical 艹 with 用, but the exact historical development and original meaning are uncertain.
The grass radical 艹 sits above 用, but without a known meaning, the character remains a mystery.
For ヨウ, imagine a yo-yo tangled in the grass on top of 用: yo-yo -> ヨウ.
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