noun
heavy material, such as gravel or sand, used to make a ship more stable or to control the draft of a vessel
verb
to provide a ship with ballast
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The ship's ballast helped stabilize it during rough seas.
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Make sure to evenly distribute the ballast in the boat before we set sail.
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I need to add more ballast to my car to improve its traction on the road.
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She found solace in the ballast of her faith during difficult times.