内うち兜かぶと

noun

inside of a helmet; hidden circumstances

Literal meaning is the interior of a helmet. Figuratively, it refers to hidden or private circumstances, often used in the idiom 内兜を見透かされる (to have one's hidden intentions seen through).

• 兜かぶとの内うち兜かぶとには汗あせがたまっていた。

  Sweat had accumulated inside the helmet.

• 彼かれは内うち兜かぶとを見み透すかされて、言こと葉ばに詰つまった。

  He was at a loss for words when his hidden motives were seen through.