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in two shakes

Also, in two shakes of a lamb's tail Very quickly, very soon, as in I'll be with you in two shakes, or She'll be finished in two shakes of a lamb's tail. The longer idiom alludes to the friskiness of lambs; the shorter one may be an abbreviation of the longer one, or it may refer to the shaking of dice or any two quick movements. [Early 1800s]

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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.