mod. anxious and eager to go. : Come on, I'm raring to go!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Very eager to begin, as in The children were all dressed and raring to go. This idiom uses raring for rearing, and alludes to a horse's standing on its hind legs when it is anxious to get moving. [Early 1900s]
