carriage wrench

From The Collaborative International Dictionary of English v.0.48:

Wrench \Wrench\ (r[e^]nch), n. [OE. wrench deceit, AS. wrenc
   deceit, a twisting; akin to G. rank intrigue, crookedness,
   renken to bend, twist, and E. wring. [root]144. See Wring,
   and cf. Ranch, v. t.]
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   1. Trick; deceit; fraud; stratagem. [Obs.]
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            His wily wrenches thou ne mayst not flee. --Chaucer.
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   2. A violent twist, or a pull with twisting.
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            He wringeth them such a wrench.       --Skelton.
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            The injurious effect upon biographic literature of
            all such wrenches to the truth, is diffused
            everywhere.                           --De Quincey.
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   3. A sprain; an injury by twisting, as in a joint.
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   4. Means; contrivance. [Obs.] --Bacon.
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   5. An instrument, often a simple bar or lever with jaws or an
      angular orifice either at the end or between the ends, for
      exerting a twisting strain, as in turning bolts, nuts,
      screw taps, etc.; a screw key. Many wrenches have
      adjustable jaws for grasping nuts, etc., of different
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   6. (Mech.) The system made up of a force and a couple of
      forces in a plane perpendicular to that force. Any number
      of forces acting at any points upon a rigid body may be
      compounded so as to be equivalent to a wrench.
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   Carriage wrench, a wrench adapted for removing or
      tightening the nuts that confine the wheels on the axles,
      or for turning the other nuts or bolts of a carriage or

   Monkey wrench. See under Monkey.

   Wrench hammer, a wrench with the end shaped so as to admit
      of being used as a hammer.
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