The sides of a ship, the parts that are not the front, back, top, or bottom.
Shipsides are big and strong, and they keep the water out of the ship.
Examples:
The waves hit the shipsides.
The shipsides are painted blue.
The shipsides are very tall.
The shipsides are like big walls.
The shipsides go all the way from the front to the back of the ship.
The shipsides are as strong as a giant's arms.