expression, godan verb (-ru)
go to sea; become a sailor
Describes the act of taking up a career or life as a sailor, often with a sense of embarking on a seafaring life.
彼は若い頃に船乗りになって、世界中を旅した。
He became a sailor when he was young and traveled all over the world.
船乗りになる
To become a sailor, you first have to build up your physical strength.