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Wiktionary
dig up

vb. 1 (context transitive English) to excavate something 2 (context transitive idiomatic English) to discover something by digging; to unearth

WordNet
dig up

v. find by digging in the ground; "I dug up an old box in the garden" [syn: excavate, turn up]

Usage examples of "dig up".

Came to us to get the Ottomans to give him permission to dig up Petra.