To discover something by digging; to unearth(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "dig up" in a sentence
"Ayla was nervous as she raced to dig up soaproot, horsetail fern, and red-rooted pigweed, and her stomach was a bundle of knots while she waited anxiously for boiling water from one of the cooking fires to extract the insecticidal element from the fern."
"Maggie was to provide me with any and every little thing she could on what Carolyn Otto had been up to over the past couple years, and dig up anything else she could on Geoffrey Sanders."
""We're going to dig up Don Bias's body, of course," Sharpe said, "and arrange to have it shipped back to Spain.""