JLPT N1Idioms

腹に一物

Readingいちもつichimotsu

Meaning
心の中にひそかなたくらみを持っている
Explanation
「腹に一物(いちもつ)」 means harboring a secret scheme or ulterior motive in one's heart. It is used with the connotation of hidden mischief, as in 「腹に一物ありそうな笑み」 (a smile that seems to hide something). c2 「強い決意を秘める」 (harboring a strong resolve) means a positive determination, which differs in nuance from the dark scheming that is the core of this question.
Original Japanese explanation

「腹に一物(いちもつ)」は、心の中にひそかなたくらみや下心を抱えていること。「腹に一物ありそうな笑み」のように、表に出さない悪だくみの含意で使う。c2「強い決意を秘める」は前向きな覚悟の意で、本問の核心である後ろ暗い魂胆とはニュアンスが異なる。

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