Meaning of BROACH in English
( n. )
A tool of steel, generally tapering, and of a polygonal form, with from four to eight cutting edges, for smoothing or enlarging holes in metal; sometimes made smooth or without edges, as for burnishing pivot holes in watches; a reamer. The broach for gun barrels is commonly square and without taper.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012