raring to go
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]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.