A picture of the state of things after the capture of Jerusalem: the slain without, the famine-stricken within. The latter are described allusively as "sicknesses of famine" (so literally). As a peculiarly striking evidence of the downfall of greatness, it is added that even prophet and priest have to go about into a land that they know not.
The verb used here can obviously not have its ordinary sense of going about for purposes of traffic. Aramaic usage suggests, however, a suitable meaning; what the prophet sketches before us is a company of these ex-grandees "begging their way" into an unknown land.