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bunker (n.)

1758, originally Scottish, "seat, bench," a word of uncertain origin, possibly a variant of banker "bench" (1670s; see bank (n.2)); or possibly from a Scandinavian source (compare Old Swedish bunke "boards used to protect the cargo of a ship"). Meaning "receptacle for coal aboard a ship" is from 1839. Of sand-holes on golf courses, by 1824, from the extended sense "earthen seat" (1805). The meaning "dug-out fortification" probably is from World War I.

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Definitions of bunker from WordNet
1
bunker (v.)
hit a golf ball into a bunker;
bunker (v.)
fill (a ship's bunker) with coal or oil;
bunker (v.)
transfer cargo from a ship to a warehouse;
2
bunker (n.)
a hazard on a golf course;
Synonyms: sand trap / trap
bunker (n.)
a large container for storing fuel;
the ship's bunkers were full of coal
bunker (n.)
a fortification of earth; mostly or entirely below ground;
Synonyms: dugout
From wordnet.princeton.edu