Skid  —v. (-dd-) 1 (of a vehicle etc.) Slide on slippery ground, esp. Sideways or obliquely. 2 cause (a vehicle) to skid. —n. 1 act of skidding. 2 runner beneath an aircraft for use when landing.  on the skids colloq. About to be discarded or defeated. Put the skids under colloq. Hasten the downfall or failure of. [origin unknown]