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lubber's hole

lubber's hole Naut.
  Also 8 lubber-hole.
  A hole in the ship's top, close to the mast, affording an easier way of ascent or descent than by climbing the futtock shrouds.

1772–84 Cook Voy. (1790) VI. 1194 He becomes as much an object of ridicule, as a sailor who descends through lubber's hole. 1792 Wolcot (P. Pindar) Peter's Prophecy Wks. 1792 III. 75 And yet, Sir Joseph, fame reports you stole To Fortune's topmast through the lubber-hole. 1833 Marryat P. Simple vii, He proposed that I should go through lubber's hole. 1882 Nares Seamanship (ed. 6) 233 Pass a hawser..through the lubber's hole.

Oxford English Dictionary

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