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belowground

[bih-loh-ground]
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adjective
  1. situated beneath the surface of the earth; subterranean.
  2. no longer living; buried, as in a cemetery (usually used predicatively): All those who might have known about the incident are now belowground.

Origin of belowground

First recorded in 1955–60; below + ground1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018