1.noun (common) (futsuumeishi); noun or participle which takes the aux. verb suru
digging deeply (below the surface); mining deep
2.noun (common) (futsuumeishi); noun or participle which takes the aux. verb suru
probing deeply (issue, problem); investigating thoroughly
3.noun (common) (futsuumeishi); noun or participle which takes the aux. verb suru
deepening relations