Skid plate
From Infogalactic: the planetary knowledge core
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A skid plate is an abrasion-resistant material affixed to the underside of a vehicle or boat[1] to prevent damage to the underside when contact is made with the ground.
Skid plates may be used on off-road vehicles and lowered vehicles to prevent damage to the underside. Fake skid plates are also added to vehicles for an off-road look.[2]