rrrrrrrrrrrrrr.

n.  a sound made while beating someone with a stick, as in the novel Riddley Walker by Russell Hoban.

RRRRRRRRRRRRRR.

n.  an “ear-shattering roar” of a motorcycle, as described in High Latitude, North Atlantic by John R. Bockstoce.

rrrrrrrrrrrrrr.

n.  the hum of a ferry boat engine.

<Alexander stood on the boat deck of a channel ferry, the rrrrrrrrrrrrrr of the engines vibrating through him, the tricolor of the French Republic snapping at the stern, as he watched Calais receding ten miles behind and daubed his nose with a sodden handkerchief.  —Richard Miller, Sowboy: A Factual Fanciful Fiction.>

n.  the rattle of an alarm clock, as described in Mama Lola: A Vodou Priestess in Brooklyn, Updated and Expanded Edition by Karen McCarthy Brown.

RrrrRRRrrRRRRR.

n.  the sound of a propeller plane.

<“Open the hangar door, here comes the plane,” he sang, aiming the fork at her mouth like a airplane.  “RrrrRRRrrRRRRR,” he rumbled, simulating the sound of a propeller plane.  —Robert Zimmerman, Genesis: The Story of Apollo 8: The First Manned Flight to Another World.>

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