sockdolager

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. ] [ 1913 Webster ]

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. ] [ 1913 Webster ]

3. Something unusually large. [ Slang, U. S. ] [ Webster 1913 Suppl. ]