to sacrifice on two successive days
肜 centers on a specific ritual act: performing a sacrifice on two consecutive days. The meaning is narrow and does not extend to general offerings or ceremonies.
肜 combines the flesh component ⺼ with 彡, which may represent repeated action or decoration. The exact historical origin of the compound is uncertain, but it likely relates to ritual practices involving meat or offerings over successive days.
The flesh component ⺼ suggests meat or a body part, and the right side 彡 looks like repeated strokes. Imagine a ritual where meat is offered on two days in a row, with the strokes marking each day's sacrifice.
For ユウ, picture a priest saying 'you' as he points to the person who must bring the sacrifice on the second day: you -> ユウ, and the ritual continues.