v.tr. 1 a cover the inside surface of (a garment, box, etc.) with a layer of usu. different material. b serve as a lining for. 2 cover as if with a lining (shelves lined with books). 3 colloq. fill, esp. plentifully. line one's pocket (or purse) make money, usu. by corrupt means.
[ ME f. obs. line flax, with ref. to the use of linen for linings ]