Definition of ballast
- tossed several tons of ballast overboard
- She provided the ballast we needed during stressful times.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ballast.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: heavy material (such as rocks or water) that is put on a ship to make it steady or on a balloon to control its height in the air
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