Antonyms of verb untwist

1 sense of untwist

Sense 1
untwist -- (cause to become untwisted)
       Antonym of twist (Sense 4)
      => twist, twine, distort -- (form into a spiral shape; "The cord is all twisted")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb untwist

1 sense of untwist

Sense 1
untwist -- (cause to become untwisted)
       => straighten, straighten out -- (make straight)