rocker arm


: a center-pivoted lever actuated by a cam to push an automotive engine valve down

Example Sentences

Recent Examples on the Web The cylinder heads could be swapped bank-to-bank, featured integral valve guides, and lacked rocker arm shafts. Car and Driver, 28 June 2020 Salvatore Vicari, the works council chief at Schaeffler’s Homburg plant, said over the din of clanking and whirring machines transforming metal bands into rocker arms that help combustion engines save fuel., 28 Mar. 2018 When deployed, the unit stretches 15.5 feet and uses rocker arms to tilt the spikes into the tire at the correct angle, ensuring maximum penetration. David Beard, Car and Driver, 31 Aug. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rocker arm.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1851, in the meaning defined above

Time Traveler
The first known use of rocker arm was in 1851

Dictionary Entries Near rocker arm

Cite this Entry

“Rocker arm.” Dictionary, Merriam-Webster, Accessed 26 Jan. 2023.

More from Merriam-Webster on rocker arm

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Fashionable Words

  • dog-sunglasses-scarf
  • Which of these items is named for a deadly weapon?
Spell It

Hear a word and type it out. How many can you get right?

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?