run to earth - Phrases/Idioms
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.
Also, run to ground. Track down, find, as in Somehow we have to run those relatives of hers to earth, or It won't be easy, but I'm sure we can run that jewelry to ground. This expression comes from hunting, where hounds run their quarry to the earth or ground, that is, to their lair. Its figurative use dates from the mid-1800s.