1. topstitch - Noun
2. topstitch - Verb
(sewing, uncountable) A sewing technique, most often used on garment edges such as necklines and hems, where it helps facings to stay in place and gives a crisp edge.
(countable) An individual stitch of this kind.
topstitch (third-person singular simple present topstitches, present participle topstitching, simple past and past participle topstitched)
(transitive) To stitch in this fashion.