Definition of patch:
(n) :
a piece of cloth, or other suitable material, sewed or otherwise fixed upon a garment to repair or strengthen it, esp. upon an old garment to cover a hole; a small piece of anything used to repair a breach; as, a patch on a kettle, a roof, etc
(v) :
to mend by sewing on a piece or pieces of cloth, leather, or the like; as, to patch a coat; to mend with pieces; to repair with pieces fastened on