rose
玫 centers on the rose, a flower known for its beauty and fragrance. The meaning is specific to this flower.
玫 combines 王 (jade) with 攵, which may have originally represented a phonetic element. The character likely referred to a type of gemstone or rose quartz, later extended to the rose flower.
The left side 王 (jade) suggests something precious, and the right side 攵 (strike) can be seen as a thorn. Imagine a precious rose with thorns: 玫 is a rose.
For バイ, picture buying a beautiful rose: buy -> バイ, and the rose is the precious flower you purchase.
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