bring up, grow up, raise, rear
毓 centers on nurturing growth: bringing up a child, raising animals, or cultivating something until it matures.
毓 is a less common variant of 育, sharing the core idea of raising or nurturing. The left side 每 and right side 㐬 likely combine to express the concept of fostering growth, but the exact historical development is uncertain.
The left side 每 (every) and right side 㐬 (a shape associated with flowing or nurturing) together suggest tending to every need so something can grow. Picture a caretaker providing for every small requirement to raise a child or plant.
For イク, imagine raising a young eucalyptus tree: eucalyptus -> イク, and you nurture it every day until it grows tall.