IPA: /bɪˈloʊˌɡraʊnd/
KK: /bɪˈloʊˌɡraʊnd/
Located or happening beneath the surface of the earth.
The belowground pipes are essential for the water supply system.
In a position that is under the surface of the earth.
The roots of the trees grow belowground to find water.
Belowground → It is formed from "below" (from Old English "belo", meaning beneath or lower) and "ground" (from Old English "grund", meaning the surface of the earth). The word "belowground" refers to something that is situated beneath the surface of the earth.
Think of something that is 'beneath' ('below') the 'earth' ('ground') — that's what belowground means.
No commonly confused words.