Definition of untie verb from the Oxford Advanced American Dictionary

 

untie

 verb
verb
NAmE//ʌnˈtaɪ//
 
untie somethingVerb Forms present simple I / you / we / they untie
 
he / she / it unties
 
past simple untied
 
-ing form untying
 
 
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to undo a knot in something; to undo something that is tied to untie a knot I quickly untied the package and peeped inside. He untied the rope and pushed the boat into the water. She untied his hands and let him go.
See the Oxford Advanced Learner's Dictionary entry: untie