unpick

unpick means to undo sewing stitches.

Etymology

From Middle English unpiken, equivalent to un- + pick.

verb

To undo sewing stitches.
To undo knitting in order to reuse the wool.
To unravel or untangle the threads of a rope etc.
To unfold; to solve.e.g.“Scientists are attempting to unpick the mystery of the “photic sneeze” – a bizarre reflex that causes people to sternutate, or sneeze, in response to bright light – and they need your help.” — 2020 October 11, Lisa Geddes, “Calling all sneezers: scientists try to unpick mystery of 'photosneezia'”, in The Guardian:
To disassemble, to undo.
To take apart; criticize harshly.e.g.“These compulsive men – and a handful of equally obsessive ‘femcels’ – have been likened to terrorists, and their forum posts have been unpicked ad nauseam.” — 2020 February 19, Jake Hall, “Investigating the insidious rise of the gay incel”, in Dazed:
To deselect.

Definitions & examples from Wiktionary (CC BY-SA 3.0).