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sea dog

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noun
  1. a sailor, especially an old or experienced one.
  2. harbor seal.
  3. a dogfish.
  4. a pirate or privateer.
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Origin of sea dog

First recorded in 1590–1600
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for sea dog

sea dog

noun
  1. an experienced or old sailor
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012