Source : Webster's Revised Unabridged Dictionary (1913)

   {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.