coudre

to sew; to mend

“dé à coudre” — thimble

Inherited from Old French coudre, cosdre, from Vulgar Latin *cōsere, from Latin cōnsuere. The original Old French infinitive was *co(u)sre, where -d- was inserted as a gliding sound. The preconsonantal -s- then became silent, in this case dropping from the spelling relatively early on. The d-spellings in the present tense are merely analogical (for expected je cous, il coût).