dun·geon /ˈdʌnʤən/
 土牢,地牢;城堡主樓
 dun·geon n.  A close, dark prison, commonly, under ground, as if the lower apartments of the donjon or keep of a castle, these being used as prisons.
    Down with him even into the deep dungeon.   -- Tyndale.
    Year after year he lay patiently in a dungeon.   -- Macaulay.
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 Dun·geon, v. t. To shut up in a dungeon.
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 dungeon
      n 1: the main tower within the walls of a medieval castle or
           fortress [syn: keep, donjon]
      2: a dark cell (usually underground) where prisoners can be
         confined
 Dungeon
    different from the ordinary prison in being more severe as a
    place of punishment. Like the Roman inner prison (Acts 16:24),
    it consisted of a deep cell or cistern (Jer. 38:6). To be shut
    up in, a punishment common in Egypt (Gen. 39:20; 40:3; 41:10;
    42:19). It is not mentioned, however, in the law of Moses as a
    mode of punishment. Under the later kings imprisonment was
    frequently used as a punishment (2 Chron. 16:10; Jer. 20:2;
    32:2; 33:1; 37:15), and it was customary after the Exile (Matt.
    11:2; Luke 3:20; Acts 5:18, 21; Matt. 18:30).