shellback

[ shel-bak ]
/ ˈʃɛlˌbæk /

noun

an old sailor.
a person who has crossed the equator by boat.

Origin of shellback

First recorded in 1880–85; shell + back1

Example sentences from the Web for shellback

British Dictionary definitions for shellback

shellback
/ (ˈʃɛlˌbæk) /

noun

informal a sailor who has crossed the equator Compare polliwog (def. 2)
an experienced or old sailor