/ Dictionary / Index K knock-on effect: Meaning and Definition of Find definitions for: knock'-on' effect" Pronunciation: (nok'on', -ôn'), [key] — Chiefly Brit. Chiefly Brit. a chain reaction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. knockoff knockout Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language