If one twists a string so that it is made tight, when the string uncurls really fast, what's the word for that?

Is it twirl, kink, or twiddle and/or do you have any better words for it?If one twists a string so that it is made tight, when the string uncurls really fast, what's the word for that?
unfurl, unwind, rewind or spin
unkink? uncurl?If one twists a string so that it is made tight, when the string uncurls really fast, what's the word for that?
Recoil?
UncoilIf one twists a string so that it is made tight, when the string uncurls really fast, what's the word for that?
unravel?

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Spiral

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