Definition: spraining

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Source: Webster's Revised Unabridged Dictionary (1913) 

Sprain \Sprain\, v. t. [imp. & p. p. Sprained; 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.