'Slope' in the Bible

Now when Ahaziah, king of Judah, saw this, he went in flight by the way of the garden house. And Jehu came after him and said, Put him to death in the same way; and they gave him a death-wound in his carriage, on the slope up to Gur, by Ibleam; and he went in flight to Megiddo, where death came to him.