un·tie

[uhn-tahy] verb, un·tied, un·ty·ing.
verb (used with object)
1.
to loose or unfasten (anything tied); let or set loose by undoing a knot.
2.
to undo the string or cords of.
3.
to undo, as a cord or a knot; unknot.
4.
to free from restraint.
5.
to resolve, as perplexities.
verb (used without object)
6.
to become untied.
00:10
Untie is one of our favorite verbs.
So is subtilize. Does it mean:
to swindle, cheat, hoodwink, or hoax.
to introduce subtleties into or argue subtly about.

Origin:
before 1000; Middle English untyen, Old English untīegan. See un-2, tie

unite, untie.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
untie (ʌnˈtaɪ) [Click for IPA pronunciation guide]
 
vb , -ties, -tying, -tied
1.  to unfasten or free (a knot or something that is tied) or (of a knot or something that is tied) to become unfastened
2.  (tr) to free from constraint or restriction

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

untie
O.E. untiegan, from un- (2) + tie (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If later the couple could not get along and wanted to divorce, they would first
  have to find the hair and untie it.
Move adjacent boats away from the fire area but don't untie burning boats to
  drift away.
When the dripping stops, untie and check the consistency.
He was so exhausted that he crawled into his hut, forgetting to untie the dogs.
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