brrrm.

n.  the perpetual drone of a drum roll; see also brrrrrrr-rrp.

<And as the first bugle notes tapered off the bass drums came to prominence.  Brrrm ... Brrrm.  —Ken Wright, “Wellesley Nautical Blyth Northumberland.”>

brrrm brrrm.

n.  the sound of a revving motorcycle engine; see also brrrm-brrrm.

<Two filthy children in rags ran alongside, holding imaginary handlebars and saying “Brrrm, brrrm,” in imitation.  —Ken Follett, The Key to Rebecca.> <“I’ll keep your coffee hot, boss.  Brrrm, brrrm!”  Biscuter had the curious habit of accompanying his activities with the noise of a 750cc motorbike.  —Manuel Vazquez Montalban, The Angst-Ridden Executive.>

brrrm brrrm brrrm.

n.  the “short throbbing” of “enemy airplane motors” (David Kenyon Weber, Parachute Infantry: An American Paratrooper’s Memoir of D-Day and the Fall of the Third Reich).

brrrm brrrrm.

n.  the electronic sounds of a space shuttle control tower.

<Lynette makes one of the dolls push a pretend button and reports, “Brrrm, brrrm, they’re going up!”  —Laura E. Berk, Awakening Children’s Minds: How Parents and Teachers Can Make a Difference.>

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