D defs.my
Entry 3 senses Webster, 1913

Sockdolager

· Sock·dol·a·ger · IPA /[ˌsɑkˈdɑːɫ.ə.d͡ʒɚ]/
01 n. That which finishes or ends a matter; a settler; a poser, as a heavy blow, a conclusive answer, and the like.
  1. 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. 2.
    A combination of two hooks which close upon each other, by means of a spring, as soon as the fish bites.(Angling) [U. S.]
  3. 3.
    Something unusually large.[Slang, U. S.]