/ Dictionary / Index B boring machine: Meaning and Definition of Find definitions for: bor'ing machine" Pronunciation: [key] a machine for boring holes in which the cutter is rotated, usually about a horizontal axis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. boring bar boring mill Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language