一いち文もん惜おしみ

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Meanings

1

Describes a person who is stingy even about trivial amounts of money, literally 'grudging a single mon (small coin)'.

I'm amazed at his stinginess over every penny.

一いち文もん惜おしみの百ひゃく知しらずということわざがある。

There's a proverb: 'Penny wise, pound foolish.'

けち
けち is a more common and colloquial word for stingy or miserly, while 一文惜しみ is a more specific and somewhat literary term emphasizing pettiness over trivial sums.
吝りん嗇しょく
吝嗇 is a formal, Sino-Japanese term for miserliness, whereas 一文惜しみ is a native Japanese compound with a more vivid, concrete image.

Compound of 一文 (one mon, a small old coin) + 惜しみ (grudging, from 惜しむ). Literally 'begrudging a single mon', expressing extreme stinginess.