broad in the beam

adjective2

1. •
   Wide across the hull.

   • Ah! She's not that old green launch with a yellow line, very broad in the beam? — 1890
2. •
   Wide across the hips, with large buttocks.

   • [T]he women of Falesa are a handsome lot to see. If they have a fault, they are a trifle broad in the beam. — 1905