在地下 zàidìxià underground Origin Definitions Defs Strokes Stroke Words Sentences Sents 在 zài preposition [location/time] Used as a linker to introduce the time, place, or situation of an action, meaning "at", "in", or "on".地下 dìxià nounlocative underground below the surface of the earth; subterranean; used to describe places or things located beneath the ground