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The Collaborative International Dictionary of English v.0.48 (gcide)

Sprain \Sprain\ (spr[=a]n), v. t. [imp. & p. p. {Sprained}
(spr[=a]nd); p. pr. & vb. n. {Spraining}.] [OF. espreindreto
press, to force out, F. ['e]preindre, fr. L. exprimere. See
{Express}, v. t., and cf. {Spraints}.]
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.
[1913 Webster]


Sprain \Sprain\, n.
The act or result of spraining; lameness caused by spraining;
as, a bad sprain of the wrist.
[1913 Webster]

{Sprain fracture} (Med.), the separation of a tendon from its
point of insertion, with the detachment of a shell of bone
to which the tendon is attached.
[1913 Webster]