Underground fortified structures built for protection during warfare, or sand-filled hazards on a golf course.
From German 'Bunker' (1910s), possibly from Old High German 'bunk' meaning bench or sleeping place. Originally referred to coal storage on ships, then applied to military fortifications. The golf course meaning came later as the sport adopted military terminology.
During World War I, bunkers became absolutely essential to survival—soldiers spent weeks underground in trenches and bunkers that protected them from artillery fire. It's wild that the same word now describes something golfers curse at!
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