noun, noun or participle which takes 'suru'
shipmates; fellow passengers
Refers to people sharing a boat or ship; often used in the set phrase 同舟相救う (people in the same boat should help each other).
彼らは同舟の客として親しくなった。
They became close as fellow passengers on the boat.
同舟相救うの精神で協力
Let's cooperate in the spirit of 'people in the same boat should help each other.'