Simple past tense and past participle of untwist.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "untwisted" in a sentence
"The trunk untwisted a fraction, and twisted back again."
"Shot of an open closet, one sweater on a wire hanger, one wire hanger untwisted on the floor by it."
"The Pleasure arising to a few Philosophers, from seeing, a few Times in their Life, the Threads of Light untwisted, and separated by the Newtonian Prism into seven Colours, can it be compared with the Ease and Comfort every Man living might feel seven times a Day, by discharging freely the Wind from his Bowels?"