sprain       
verb [ T ] uk/spreɪn/ us/spreɪn/
 扭伤(关节)
to cause an injury to a joint (= a place where two bones are connected) by a sudden movement
  She sprained her ankle playing squash. 她打壁球扭伤了脚踝。 
 He stumbled and sprained a knee.
 Synonyms: rick turn twist wrench 
 - More examples
 - She must have sprained or broken her wrist.
 - He sprained his right knee while training with the national team.
 - He could struggle to play a major part in the tournament after badly spraining his right ankle.