unthread

UK: /ʌnˈθrɛd/ US: (un thred′)

WordReference Random House Unabridged Dictionary of American English © 2025

un•thread  (un thred′), v.t. 

1. to draw out or take out the thread from:
   to unthread a sewing machine.
2. to thread one's way through or out of, as a densely wooded forest.
3. to disentangle;
   separate out of a raveled or confused condition:
   to unthread a mystery.

• un-² + thread 1585–95

Collins Concise English Dictionary © HarperCollins Publishers::

unthread / ʌnˈθrɛd/ verb (transitive)

1. to draw out the thread or threads from (a needle, etc)
2. to disentangle