English edit

Etymology edit

under- +‎ grub

Verb edit

undergrub (third-person singular simple present undergrubs, present participle undergrubbing, simple past and past participle undergrubbed)

  1. (UK, dialect) To undermine.
    • 2006, Galway Kinnell, Strong Is Your Hold:
      Sexton beetles, corpse-eating buriers who delve and undergrub him and howk out the trench his sausagy form settles into.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for undergrub”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)