adverb (or adjective)
: with the force and violence of a blacksmith pounding iron : with all one's strength : in a rough-and-tumble manner
the wedding party going it hammer and tongs down the road — Richard Llewellyn
go after a witness in the old hammer-and-tongs style — Mitchell Dawson
has gone at his job in a hammer-and-tongs way that has annoyed — and offended — a good many businessmen — Newsweek