undergrubとは意味・読み方・使い方

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From under- +‎ grub.

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

(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.