Examples from the Web for second mate
At the end of that time, I went on board the Sally, a ship also bound to Greenock, as her second-mate.
The second-mate was so astounded at what he regarded as super-colossal impudence and ingratitude, that he just gasped.
"Half a mo, Mac," said the second-mate, as the engineer made another attempt to escape.
I shipped as a sort of second-mate, keeping a watch, though I lived forward at my own request.
It was actually greater preferment for me than when I was raised from third to be second-mate.Afloat And Ashore|James Fenimore Cooper