from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To dig down.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To delve under.
from The Century Dictionary and Cyclopedia
- To dig down.
From Middle English underdelven, from Old English underdelfan ("to dig under, undermine, break through"), equivalent to under- + delve. (Wiktionary)
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