v.1. To put the framework for the top story on some building: Workers topped out the tower with the last few beams. The contractor will top the building out at a ceremony on Tuesday.
2. To fill something, such as a ship, until it is full: The crew topped out the ship with cargo. We topped the rest of the box out with foam padding.
3. To cease rising; reach the highest point or degree: Interest rates topped out at 16 percent. The balloon rose for a while but finally topped out.