1) In this early usage ‘meat’ was food, and the meat-board was a dining table, that is boards supported on trestles.
c.1413 et en un metborde de longure dun waynscotte, York
1432 Item to Alice Page j met bord with j pare trysts, Scarborough
1485 j mete-burde with ij par of trysylls, York
1533 three meate burdys, and a dische burd, Pannal
1570 One table one little meat bourd, Hutton Conyers.