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Definition of Underseal
1. Noun. Seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion.
Definition of Underseal
1. Noun. A thick, resilient coating applied to the underbody or chassis of an automobile to protect against damage from small stones, etc, which would rapidly chip ordinary paint and allowing rusting to begin. ¹
2. Verb. (transitive) To coat (the underbody or chassis of a vehicle) with underseal. ¹
¹ Source: wiktionary.com