bilge

noun
🔊/bɪldʒ/
🔊/bɪldʒ/
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  1. [countable]
    (also bilges [plural])
    the almost flat part of the bottom of a boat or a ship, inside or outside舭;底舱Topics Transport by waterc2
  2. (also bilge water)
    [uncountable] dirty water that collects in a ship’s bilge底舱污水
  3. Word Originlate 15th cent.: probably a variant of bulge.