noun
Definition: A heavy material used to provide stability, often placed in ships or balloons, or a type of gravel used for building roads and railways.
Example: The ship was filled with ballast to ensure it remained stable in rough waters.
transitive verb
Definition: To fill or support something, especially a structure like a railroad bed, with heavy material to provide stability.
Example: The workers will ballast the tracks to ensure they remain stable during heavy trains.