mudflaps

/ˈmʌdflæps/
noun
  1. Flexible pieces of material hanging behind the wheels of a vehicle to prevent mud, water, or stones from being thrown up.
    • The truck's mudflaps kept the gravel from hitting the car behind it.
    • He installed new mudflaps on his pickup to protect the paint from road debris.
    • The old mudflaps were torn and needed to be replaced before the next rainy season.