Breadcrumb Home > Dictionary > Index R rocker arm: Meaning and Definition of Find definitions for: rock'er arm" Pronunciation: [key] — Mach. Mach. a rocking or oscillating arm or lever rotating with a moving shaft or pivoted on a stationary shaft. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rocker rocker panel TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: limpid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language