bunker

n. [ Scot. bunker, bunkart, a bench, or low chest, serving for a seat. Cf. Bunk, Bank, Bench. ] [ 1913 Webster ]

1. A sort of chest or box, as in a window, the lid of which serves for a seat. [ Scot. ] Jamieson. [ 1913 Webster ]

2. A large bin or similar receptacle; as, a coal bunker. [ 1913 Webster ]

3. A small sand hole or pit, as on a golf course. [ Scot. ] Sir W. Scott. [ Webster 1913 Suppl. ]

4. (Golf) Hence, any rough hazardous ground on the links; also, an artificial hazard with built-up faces. [ Webster 1913 Suppl. ]

5. (Mil.) A fortified position dug into the ground, especially one which is closed on top and has protective walls and roof, e. g. of reinforced concrete. For defending positions it usually has windows to view the surrounding terrain, but as a safe location for planning operations or storage, a bunker may be completely underground with no direct access to the surface. [ PJC ]