Albert Barnes Commentary Jeremiah 48:18

"O thou daughter that dwellest in Dibon, come down from thy glory, and sit in thirst; for the destroyer of Moab is come up against thee, he hath destroyed thy strongholds." — Jeremiah 48:18 (ASV)

Sit in thirst - Jeremiah draws a picture of the conquered inhabitants, collected outside the walls, waiting for their captors to march them away to the slave market. The enemy occupied with plundering the houses of Dibon thinks little of the hunger and thirst of his prisoners.

Strong holds - The remains of the fortifications of Dibon are still visible.