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sea-dog (n.)
[sea-dog 词源字典]
1590s, "harbor seal," from
sea
+
dog
(n.). Also "pirate" (1650s). Meaning "old seaman, sailor who has been long afloat" is attested from 1840.
[sea-dog etymology, sea-dog origin, 英语词源]
[sea-dog 词源字典]