Therefore this is what the Lord GOD says: Behold, I am against Pharaoh king of Egypt. I will break his arms, both the strong one and the one already broken, and will make the sword fall from his hand.
Therefore God is against Pharaoh and will break both his arms, the strong one and the broken one.
This verse intensifies the sentence into total incapacitation.
20In the eleventh year, on the seventh day of the first month, the word of the LORD came to me, saying, 21“Son of man, I have broken the arm of Pharaoh king of Egypt. See, it has not been bound up for healing, or splinted for strength to hold the sword. 22Therefore this is what the Lord GOD says: Behold, I am against Pharaoh king of Egypt. I will break his arms, both the strong one and the one already broken, and will make the sword fall from his hand. 23I will disperse the Egyptians among the nations and scatter them throughout the lands. 24I will strengthen the arms of Babylon’s king and place My sword in his hand, but I will break the arms of Pharaoh, who will groan before him like a mortally wounded man. 25I will strengthen the arms of Babylon’s king, but Pharaoh’s arms will fall limp. 26Then they will know that I am the LORD, when I place My sword in the hand of Babylon’s king, and he wields it against the land of Egypt. I will disperse the Egyptians among the nations and scatter them throughout the lands. Then they will know that I am the LORD.”