一いち分ぶん

noun

duty; honor; one's part

Refers to one's social or moral obligation, or the honor and standing one must uphold. Often used in contexts of fulfilling one's role or maintaining face.

• 彼かれは自じ分ぶんの一いち分ぶんを果はたすために全ぜん力りょくを尽つくした。

  He did his utmost to fulfill his duty.

• 武ぶ士しにとって一いち分ぶんを守まもることは何なによりも大たい切せつだった。

  For samurai, preserving their honor was more important than anything else.