dig up

dig up idiom
  1. Search out, find, obtain, as in I'm sure I can dig up a few more supporters. [Mid-1800s]
  2. dig up some dirt or the dirt. Find derogatory information about someone or something. For example, The editor assigned him to dig up all the dirt on the candidates. The slangy use of the noun dirt for “embarrassing or scandalous information” dates from about 1840, but this metaphoric expression is a century newer.

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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