陥かん没ぼつ乳ち首くびMeaningsNoun1. inverted nipple; retracted nippleKanji used陥cave in没go under乳milk首neckComposed of陥かん没ぼつcave-in; collapse; sinking; depression (e.g. of the skull); subsidenceNoun乳ち首くびnipple; teatNoun