down to the ground
Thoroughly, completely, as in This new job suits him down to the ground. [Colloquial; second half of 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for down to the ground
Historical Examples of down to the ground
How are we to get the down-to-the-ground work of the land done without the aid of such?Criminal Types
V. M. Masten