root and branch

root and branch idiom
Utterly, completely, as in The company has been transformed root and branch by the new management. Alluding to both the underground and aboveground parts of a tree, this idiom was first recorded in 1640.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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