bunker

The origin of the noun is uncertain; the earliest sense is sense 7.1 (“box or chest, the lid of which serves as a seat”), from Scots bunker (“bench; pew; window-seat; sand pit (especially in golf); coal receptacle; sleeping berth, bunk”), from Early Scots bunker, bunkur, bonker (“a chest or box, often serving as a seat”), probably from Old Norse bunki (“a heap”) (probably whence bunk (“sleeping berth in a ship, train, etc.”)), from Proto-Germanic *bunkô (“a heap, pile; a bump, lump, a crowd”), perhaps from Proto-Indo-European *bʰenǵʰ- (“thick”) or *bʰeg- (“to billow, swell; to arch, bend, curve (?)”). Compare Middle Low German bunge (“drum, container”), Middle High German bunge (“drum”).

出典: Wiktionary「bunker」（CC BY-SA 4.0）