ankle       
noun [ C ] uk/ˈæŋ.kəl/ us/ˈæŋ.kəl/
B1 踝关节;踝
the joint (= place where two bones are connected) between the foot and the leg, or the thin part of the leg just above the foot
  I fell over and sprained/twisted my ankle. 我摔倒了,扭伤了脚踝。 
 - More examples
 - The nurse bandaged my sprained ankle to keep the swelling down.
 - Three minutes into the match, Jackson limped off the pitch with a serious ankle injury.
 - She sprained her ankle playing squash.
 - She broke her ankle when she had a nasty trip on the stairs.
 - An ankle injury meant she missed the opportunity to run in the qualifying heat.