overground
/ˈəʊvəgraʊnd/adverb & adjective
1- on or above the ground在地面上（的）：
as adv. it has suggested that a new line be built overground有人建议在地面上修建一条新线路
as attrib. adj. a huge heating system pipes heat along overground tubes.巨型供热系统沿着地面管道送热。
1.1
- as attrib. adj. legitimate; not subversive合法的; 非颠覆性的：
they devised plans for using overground political processes.
他们制订了使用合法政治程序的计划。