Tog·gle n.  [Written also toggel.]
 1. Naut. A wooden pin tapering toward both ends with a groove around its middle, fixed transversely in the eye of a rope to be secured to any other loop or bight or ring; a kind of button or frog capable of being readily engaged and disengaged for temporary purposes.
 2. Mach. Two rods or plates connected by a toggle joint.
 Toggle iron, a harpoon with a pivoted crosspiece in a mortise near the point to prevent it from being drawn out when a whale, shark, or other animal, is harpooned.
 Toggle joint, an elbow or knee joint, consisting of two bars so connected that they may be brought quite or nearly into a straight line, and made to produce great endwise pressure, when any force is applied to bring them into this position.

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 toggle joint
      n : a joint made by two arms attached by a pivot; used to apply
          pressure at the two ends by straightening the joint