Torsion is a noun that refers to ‘the act of twisting.’

The Latin word torquere (tork WHERE ay) means ‘to twist.’ Torsion is a versatile word that has a use in medicine as well as mathematics where it refers to the extent to which a curve departs from being planar.

But in ordinary English it can simply refer to any act of twisting. For example: At grandpa’s age, he really shouldn’t be twisting the night away like he did as a teenager. All that torsion on his hips can make him twist and shout in more ways that one.