skid plate
n.— «While the suicide doors are enough to please most car fans, the skid plates (as the Brits call them. We call ‘em “side rocker panels”) are even cooler. These skid plates fold down and away from the body to create a step into the iosis X. These are way cooler than the hydraulic step bars found on many SUVs today.» —“Ford iosis X Concept” by Justin Kaehler IGN Oct. 11, 2006. (source: Double-Tongued Dictionary)