sprain
     n : a painful injury to a joint caused by a sudden wrenching of
         its ligaments
     v : twist suddenly so as to sprain; "wrench one's ankle"; "The
         wrestler twisted his shoulder"; "the hikers sprained
         their ankles when they fell"; "I turned my ankle and
         couldn't walk for several days" [syn: {twist}, {wrench},
         {turn}, {wrick}, {rick}]
Source: WordNet® 2.0