A reinforced underground shelter, typically for military defense, or a sand trap on a golf course.
Originally from Scots 'bunker' meaning a chest or box for storage. Extended to coal bunkers on ships, then to military fortifications. The golf sense developed from the similarity to a pit or hollow.
The word's journey from Scottish storage chest to military fortress to golf hazard shows how contexts shape meaning. A bunker can protect you (military) or penalize you (golf) - same structure, opposite purposes!
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