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What is the underside of a car called?

My brother-in-law says the underside of a car is called the chassis, but I think it’s called the undercarriage. What is the underside of a car called?

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Rachel Rigolino · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
The underside of a car is commonly called the undercarriage. This goes back to the days of the horse and carriage.
Your brother-in-law is correct in that the chassis, which is the vehicle’s frame, is located underneath a car. However, technically speaking, the undercarriage contains the chassis. To give him credit, people often use the terms chassis and undercarriage interchangeably.
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