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from the ground up

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From the very beginning; also, completely, thoroughly. For example, We've had to learn a new system from the ground up, or The company changed all of the forms from the ground up. This expression alludes to the construction of a house, which begins with the foundation.

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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.

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