English to English

verb (v)

• to move in a twisting or contorted motion, (especially when struggling)(verb.motion)

  Example:
  The prisoner writhed in discomfort.
  

  Synonym:
  squirm, twist, worm, wrestle, wriggle
  

  source: wordnet30
• To twist; to turn; now, usually, to twist or turn so as to distort; to wring.(verb)

  source: webster1913
• To twist or contort the body; to be distorted; as, to writhe with agony. Also used figuratively.(verb)

  source: webster1913