The side of a ship.
The shipside is where you get on and off a ship.
Examples:
The shipside is where we get on the boat.
We stood by the shipside and waved goodbye.
The shipside is very big and made of metal.
I saw a fish jump out of the water by the shipside!
The shipside is so tall, it almost touches the sky.
I like to sit by the shipside and watch the water.