胸むねに一いち物もつ

expression

secret scheme; hidden agenda; trick up one's sleeve

Idiomatic expression meaning to harbor a secret plan or ulterior motive. Often used with verbs like ある or 抱く. Compare 腹に一物, which has the same meaning but uses 腹 (belly) instead of 胸 (chest).

See also: 腹に一物

• 彼かれの親しん切せつな態たい度どの裏うらには、胸むねに一いち物もつあるに違ちがいない。

  Behind his kind attitude, he must have a secret scheme.

• あの笑え顔がおの下したに胸むねに一いち物もつを抱だいているようだ。

  It seems he harbors a hidden agenda beneath that smile.