うちまく 内幕 Common word LinksSentence search for 内幕Sentence search for うちまくSentence search for ないまくKanji details for 内 and 幕Edit in JMdict Noun1. lowdown; inside information; hidden circumstances; inside facts; inner workings; undisclosed circumstancesNoun2. inner curtain (in a military encampment)Historical term, Only applies to うちまく, See also 外幕Other forms内幕 【ないまく】 Discussions Log in to talk about this word.