Dic: on the ground

| 현장[현지]에서.

1. in the place where sth is happening and among the people who are in the situation, especially a war. 
2. among ordinary people or people closely involved in sth. 

• On the ground, there are hopes that the fighting will soon stop. 현지에서는 전쟁이 곧 끝날 것이라는 희망을 품고 있다. 
• There's a lot of support for the policy on the ground. 현장에서는 그 정책에 대한 지지가 많다.

..... OALD, Oxford Idioms (네이버, 다음)

cf.
on the ground: in the place or situation where something important is happening, rather than somewhere else - used especially in news reports:

• While the politicians talk of peace, the situation on the ground remains tense.

.... Longman

cf.
on the ground: at the scene of action (merriam-webster)
on the ground: At a place that is exciting, interesting, or important(American Heritage)

cf. off the ground: Under way, as if in flight: 

• Because of legal difficulties, the construction project never got off the ground. (American Heritage)