What does 2 Kings 18:21 mean?

Are you depending on Egypt? Leaning on them is like using a broken stick for support—it’ll just stab you in the hand. That’s what happens to anyone who trusts Pharaoh, king of Egypt. 2 Kings 18:21 - Modern Text Bible

(He warns that Egypt is unreliable and will only hurt those who trust it, trying to cut off any hope of outside help.)