1. Literally, to dig a hole into something, such as the ground. I had to dig down and create holes in the soil before I could plant the flowers.
2. To spend one's money. We had to dig down after our construction budget ballooned beyond what we had planned.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dig downand dig deep
1. . Lit. to excavate deeply. They are really having to dig deep to reach bedrock. We are not to the buried cable yet. We will have to dig down some more.
2. Fig. to be generous; to dig deep into one's pockets and come up with as much money as possible to donate to something. (As if digging into one's pocket.) Please dig down. We need every penny you can spare. Dig down deep. Give all you can.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Pay with money from one's own pocket; be generous. For example, We've got to dig down deep to make the next payment. [Colloquial; c. 1940]
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.