Directly in an area of interest or active operations; in the field.
Used other than figuratively or idiomatically: see on, the, ground.
Source: en.wiktionary.orgA new word is like a fresh seed sown on the ground of the discussion. Ludwig Wittgenstein
No man is justified in doing evil on the ground of expedience. Theodore Roosevelt
Keep your eyes on the stars, keep your feet on the ground. Theodore Roosevelt
No matter how beautiful the shoes are, they still have to go on the ground. Haitian Proverb
Even the loftiest of mountains begins on the ground. Moroccan Proverb
The one who sits on the ground need not fear a fall. Czech Proverb