rocker arm

At St. Barnabas Hospital, Pellerano was listed in stable condition with wounds to his chest and arm.
Shot Down During the NYPD Slowdown|Michael Daly|January 7, 2015|DAILY BEAST
The big slug happened to hit the suspect in the street, passing through his arm and then striking Police Officer Andrew Dossi.
Shot Down During the NYPD Slowdown|Michael Daly|January 7, 2015|DAILY BEAST
He plays an aging punk rocker and I play the drummer from his old band.
Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST
Dossi initially was listed in critical condition with wounds to his arm and lower back.
Shot Down During the NYPD Slowdown|Michael Daly|January 7, 2015|DAILY BEAST

She is wearing a crop top, and Andrew has his arm wrapped around her waist.
Buckingham Palace Disputes Sex Allegations Against Prince ‘Randy Andy’|Tom Sykes|January 4, 2015|DAILY BEAST
She was holding the back of her chair with one hand; her loose sleeve had slipped almost to the shoulder of her uplifted arm.
The Awakening and Selected Short Stories|Kate Chopin
In Spain he was regarded as the right arm of the ultra-clericals and a possible supporter of Carlism.
The Philippine Islands|John Foreman
Grandmamma sits in her quaint arm-chair— Never was lady more sweet and fair!
Boys and Girls Bookshelf; a Practical Plan of Character Building, Volume I (of 17)|Various
She looked up in his face, leaning on his arm beneath the encircling shadow of the umbrella which he had lifted.
The Awakening and Selected Short Stories|Kate Chopin
But the strength of his arm, and the bravery of his heart could not have defended him long against their determined attack.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter

British Dictionary definitions for rocker arm

rocker arm

noun

a lever that rocks about a pivot, esp a lever in an internal-combustion engine that transmits the motion of a pushrod or cam to a valve

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012