百ひゃく日にちの説せっ法ぽう屁へ一ひとつ

expression

one blunder ruins all one's hard work

Proverb meaning that a single careless mistake can undo the results of long, patient effort. Literally 'one fart in a hundred days of sermons'.

• 百ひゃく日にちの説せっ法ぽう屁へ一ひとつで、長なが年ねんの信しん頼らいを一いっ瞬しゅんで失うしなってしまった。

  Just like 'one fart in a hundred days of sermons,' I lost years of trust in an instant with a single blunder.