? a stitch drawn right through the stuff;
hence, figuratively, in reference to thoroughness of action (obsolete rare)
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from thorough (adv.) and stitch (n.)
From: Fables of Aesop
and Other Eminent Mythologists, With Morals and Reflections.
By Sir Roger L'Estrange, 1692
Aesop's Fables, Fab. CXXXIII. A Hare and a Tortoise