his wings. Probably referring to the wings of his army.
Irnmanuel. GOD with us. This shows that the prophecy in Isaiah 7:14 was not to be exhausted with Ahaz and his times.
Related Commentaries of Isaiah 8:8
Isaiah 8:8
8 And he shall pass through Judah; he shall overflow and go over, he shall reach even to the neck; and the stretching out of his wings shall fill the breadth of thy land, O Immanuel.