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speed demon

noun, Informal.
a person who travels or works at high speed. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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speed demon

noun phrase

A person who drives fast or is a fast runner: speed demon on the court

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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