UNPICK
unpick
(verb) undo (the stitches) of (a piece of sewing)
unravel, unknot, unscramble, untangle, unpick
(verb) become or cause to become undone by separating the fibers or threads of; “unravel the thread”
Source: WordNet® 3.1
Etymology
Verb
unpick (third-person singular simple present unpicks, present participle unpicking, simple past and past participle unpicked)
(sewing) To undo sewing stitches.
(knitting) To undo knitting in order to reuse the wool.
To unravel or untangle the threads of a rope etc.
(figuratively) To disassemble.
Source: Wiktionary
Un*pick, v. t. Etym: [1st pref. un- (intensive) + pick.]
Definition: To pick out; to undo by picking.
Source: Webster’s Unabridged Dictionary 1913 Edition