Wiktionary
a. on the spot, in situ
Usage examples of "on the ground".
But the defender has on his side another small advantage as well, which is that he is more at home than the assailant, on the ground which forms his position, and therefore, like the inhabitant of a room, will find his way about it in the dark with more ease than a stranger.
He set him down gently on the ground and then Maximilian was beside me and we were kneeling down beside our son.
As they accelerated, the men on the ground drew away, shielding their faces against the whirling snow.
The professor began to notice a deposit of ash that lay thickly on the ground in sheltered places.
The huge bear struggled on the ground for some moments before anybody dared approach.
Grasshoppers are as thick walking up the east side of the house as they are on the ground, and they are not going around the attic window.