The Collaborative International Dictionary
Thoroughstitch
Thoroughstitch \Thor"ough*stitch`\, adv. So as to go the whole length of any business; fully; completely. [Obs.]
Preservance alone can carry us thoroughstitch.
--L'Estrange.
Wiktionary
thoroughstitch
adv. (context obsolete English) So as to go the whole length of any business; fully; completely.