Sprain

To weaken, as a joint, ligament, or muscle, by sudden and excessive exertion, as by wrenching; to overstrain, or stretch injuriously, but without luxation; as, to sprain one's ankle.

The act or result of spraining; lameness caused by spraining; as, a bad sprain of the wrist.

a painful injury to a joint caused by a sudden wrenching of its ligaments