Whipstitch definition of whipstitch by The Free DictionaryWhipstitch represents a needlework technique which involves creating small in-out stitches in order to firmly join two material pieces together. This method provides strength and avoids the fabric from fraying. The overcast can be used for a variety of sewing projects, including hemming, stitching appliques, or even creating blankets. It offers a clean and expert look for the final item.