Sprain (sprān), v. t. [imp. & p. p.Sprained (sprānd); p. pr. & vb. n.Spraining.] [OF. espreindreto press, to force out, F. épreindre, 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.