Source : Webster's Revised Unabridged Dictionary (1913)

Sockdolager \Sock*dol"a*ger\, n. [A corruption of doxology.]
   [Written also {sockdologer}.]
   1. That which finishes or ends a matter; a settler; a poser,
      as a heavy blow, a conclusive answer, and the like.
      [Slang, U.S.]

   2. (Angling) A combination of two hooks which close upon each
      other, by means of a spring, as soon as the fish bites.
      [U. S.]