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sea dog

American  
[see dawg, dog] / ˈsi ˌdɔg, ˌdɒg /
Sometimes seadog

noun

  1. Informal. a sailor, especially an old or experienced one.

  2. harbor seal.

  3. a dogfish.

  4. Informal. a pirate or privateer.

sea dog British  

noun

  1. an experienced or old sailor

"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

Etymology

Origin of sea dog

First recorded in 1590–1600

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.