spleen
脾 centers on the spleen, an organ in the body.
脾 combines the flesh radical ⺼ (body part) with 卑, which likely contributes the sound ヒ. The character specifically denotes the spleen.
The left side ⺼ is a body part, and the right side 卑 looks like a lowly servant. Imagine the spleen as the humble, overlooked organ that quietly supports the body.
For ヒ, picture the spleen letting out a soft 'hee' of relief when it finally gets some attention: hee -> ヒ.
—