WordReference Random House Learner's Dictionary of American English © 2017
sprain /spreɪn/USA pronunciation   v. [+ object]
  1. Pathologyto overstrain or twist (the ligaments around a joint) so as to injure without a fracture or break:He sprained his knee when he twisted it and fell.

n. [countable]
  1. Pathologyan injury to the ligaments around a joint.

WordReference Random House Unabridged Dictionary of American English © 2017
sprain  (sprān),USA pronunciation v.t. 
  1. Pathologyto overstrain or wrench (the ligaments of an ankle, wrist, or other joint) so as to injure without fracture or dislocation.

n. 
  1. Pathologya violent straining or wrenching of the parts around a joint, without dislocation.
  2. Pathologythe condition of being sprained.
  • origin, originally uncertain 1595–1605
    • 1.See corresponding entry in Unabridged twist. See  strain 1.


Collins Concise English Dictionary © HarperCollins Publishers::

sprain /spreɪn/ vb
  1. (transitive) to injure (a joint) by a sudden twisting or wrenching of its ligaments
n
  1. the resulting injury to such a joint, characterized by swelling and temporary disability
Etymology: 17th Century: of uncertain origin



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