What do you mean by shipmate?

A shipmate is someone who has friendship on board.

The basic meaning of "boat" is water vehicles, such as boats and boats. In daily use, it is also often used as a noun, indicating a space vehicle, such as a spaceship.

The basic meaning of "friend" is people who have friendship with each other, such as friends and friendship; By extension, it means having close and harmonious relations, such as friendly countries and neighbors; Lovers, such as friendship, friendliness. In daily use, it is often used as a noun to express friends, such as close friends.