verb (used with object)
to draw out or take out the thread from: to unthread a sewing machine.
to thread one's way through or out of, as a densely wooded forest.
to disentangle; separate out of a raveled or confused condition: to unthread a mystery.

1585–95; un-2 + thread

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World English Dictionary
unthread (ʌnˈθrɛd)
1.  to draw out the thread or threads from (a needle, etc)
2.  to disentangle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Do not attempt to unthread or rethread the canister while in a contaminated environment.
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