bunker
n. countablen. a strong building built mostly underground to protect people or things from bombs and attacks. You also see these on golf courses as holes filled with sand that are hard to hit out of.
n. a reinforced underground shelter, typically constructed of concrete, designed to protect occupants or equipment from aerial bombardment or artillery fire. Also refers to a sand-filled hazard on a golf course.
The soldiers stayed in the bunker during the storm.
During the Cold War, many governments built deep bunkers to ensure that leaders could survive a nuclear strike.
The golfer's ball landed deep in a greenside bunker, forcing him to play a difficult sand shot to save par and maintain his lead in the tournament.
Commonly used in military contexts for protection or in sports contexts specifically for golf hazards.