verb (used with object), untied, untying.
to loose or unfasten (anything tied); let or set loose by undoing a knot.
to undo the string or cords of.
to undo, as a cord or a knot; unknot.
to free from restraint.
to resolve, as perplexities.
verb (used without object), untied, untying.
to become untied.

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. 2014.
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World English Dictionary
untie (ʌnˈtaɪ)
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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Word Origin & History

O.E. untiegan, from un- (2) + tie (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The amity that wisdom knits not, folly may easily untie.
They're excellent bed warmers, and small fingers can untie hopeless knots.
Before you marry beware, for it is a knot difficult to untie.
To a couple interested only in the fastest way to untie the knot, the question
  may seem to be an unimportant technicality.
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