Definition of ground-pea:
(n) :
The surface of the Earth, as opposed to the sky or water or underground.
(n) :
(uncountable) Terrain.
(n) :
Soil, earth.
(n) :
(countable) The bottom of a body of water.
(n) :
Basis, foundation, groundwork, legwork.
(n) :
(chiefly in the plural) Reason, (epistemic) justification, cause.