Etymology
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untie (v.)

Old English untigan "loosen, unchain," from un- (2) "opposite of" + tie (v.). Related: Untied; untying.

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Definitions of untie

untie (v.)
undo the ties of;
They untied the prisoner
Synonyms: unbrace / unlace
untie (v.)
cause to become loose;
untie the knot
Synonyms: undo / loosen
From wordnet.princeton.edu