腹

Left meat-flesh radical - the side-form of 肉 used at the left margin. Visually identical to the moon 月 but a different element: this is a slab of meat, the body-tissue radical. Anchors 腹 in the anatomy family with 胸 (chest), 背 (back), 脏 (organ), 肝 (liver), 肠 (intestine). The radical states bluntly: this character names a part of the body.

Right 复 supplies the sound - fù matches the parent reading with no drift. 复 originally depicted a footprint going back and forth on a path, the seed for 'return, repeat.' Same phonetic appears in 覆 (cover), 复 (resume), 馥 (fragrant). For 腹 the picture suits well: the belly is the cavity that repeatedly fills and empties with each breath and meal.