foul-smelling grass
蕕 refers to a specific kind of grass known for its foul smell. The meaning is narrow and concrete, with no clear abstract extensions.
蕕 combines the grass radical 艹 with 猶, which likely provides the sound. The exact historical development is uncertain, but the structure suggests a phono-semantic compound for a type of plant.
The grass radical 艹 sits above 猶, which looks like a suspicious animal. Imagine a patch of grass that smells so foul even a wary beast hesitates to step into it.
For ユウ, picture the foul grass making you say 'you!' in disgust: you -> ユウ, and the smell is unforgettable.
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