Definition of root digger in US English:

root digger

noun

historical
  • 1A member of any of various North American Indian peoples with a staple diet of roots and tubers, especially a member of certain Numic-speaking peoples of the Great Basin.

  • 2An implement for digging up edible roots, specifically one used by North American Indians.

Origin

Mid 19th century; earliest use found in William Gordon (fl. 1763–1809).