(someone) sprained (a joint)
"Spraining" something like your ankle or wrist means that the ligaments (the fibers that connect muscles to bones) get stretched too much.
When you sprain a joint, it hurts and swells up. It usually heals within a few days if you rest and don't injure it again.
"Sprain" can also be used as a noun:
Sprains and muscle tears should be treated with rest and icing.