埋まい没ぼつ費ひ用ようMeaningsNoun1. sunk costKanji used埋to fill up (a hole)没go under費expense用used forComposed of埋まい没ぼつbeing buried; remaining unknown; being forgotten; being absorbed (e.g. in research); being immersedNoun費ひ用ようcost; expenseNoun