Sledge-hammer
. A sledge-hammer argument. A clincher; an argument which annihilates opposition at a blow. The sledge-hammer is the largest sort of hammer used by smiths, and is wielded by both hands. The word sledge is the Saxon slecge (a sledge).
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.