flat spot noun 1flat-spot verb 1forms 4 noun1 •A small patch of a vehicle tyre that has been flattened by abrasion with the road surface, so that the tyre is no longer smoothly circular at that point; usually caused by the wheel locking under heavy braking. flat-spot verb1 •To cause a flat spot on (a vehicle tyre), usually by locking the wheels under heaving braking.Hamilton locked up at turn three and flat-spotted his right front tyre. formsflat-spotted · flat-spotting · flat-spots · flat spots