sprain
/spreɪn; spren/ v[Tn]
injure (a joint in the body, esp a wrist or an ankle) by sudden twisting or wrenching so that there is pain and swelling 扭伤（关节, 尤指腕和踝）
sprain one's wrist 扭伤手腕
suffering from a sprained ankle 踝部扭伤. sprain, n injury caused in this way 扭伤
a bad sprain 严重的扭伤.