From Middle English untien, unteyen, untyȝen, untiȝen, from Old English untīġan, equivalent to .

• IPA: /ʌnˈtaɪ/

untie (unties, present participle untying; simple past and past participle untied)

1. (transitive) To loosen, as something interlaced or knotted; to disengage the parts of.

   to untie a knot

   • c. 1606–1607 (date written), William Shakespeare, “The Tragedie of Anthonie and Cleopatra”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act V, scene ii], page 367 ↗:

     Haſt thou the pretty vvorme of Nylus [an asp] there, / That killes and paines not? / […] / Come thou mortal vvretch, / VVith thy ſharpe teeth this knot intrinſicate, / Of life at once vntye: Poore venomous Foole, / Be angry, and diſpatch.

   • 1645, Edmund Waller, To Amoret:

     Sacharissa's captive fain / Would untie his iron chain.

2. (transitive) To free from fastening or from restraint; to let loose; to unbind.
   • c. 1606 (date written), William Shakespeare, “The Tragedie of Macbeth”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act IV, scene i]:

     Though you untie the winds, and let them fight / Against the churches.

   • 1651, Jer[emy] Taylor, The Rule and Exercises of Holy Living. […], 2nd edition, London: […] Francis Ashe […], →OCLC ↗:

     All the evils of an untied tongue we put upon the accounts of drunkenness.

3. To resolve; to unfold; to clear.
   • 1668, John Denham (poet), Of Prudence (poem)

     They quicken sloth, perplexities untie.

4. (intransitive) To become untied or loosed.
5. (programming, transitive) In the Perl programming language, to undo the process of tying, so that a variable uses default instead of custom functionality.
   • 2002, Dave Roth, Win32 Perl Programming: The Standard Extensions, page 151:

     After you finish with the INI file, all you need to do is untie the hash. Then you really are finished!

• unfasten

• tie

• French: détacher, délier
• German: losbinden
• Italian: disfare, sciogliere, slegare
• Portuguese: desamarrar, desatar
• Russian: развя́зывать
• Spanish: desatar, desamarrar, desligar

• French: détacher
• German: losmachen
• Italian: disfare
• Portuguese: desamarrar, desatar
• Russian: отвя́зывать
• Spanish: soltar

• German: aufklären, auflösen, beschließen, beseitigen, lösen
• Portuguese: resolver
• Russian: реша́ть
• Spanish: desatar

• French: détacher
• German: sich lösen
• Italian: sciogliersi
• Portuguese: soltar
• Russian: развя́зываться
• Spanish: desatarse