perdido por cem, perdido por mil

ことわざ

一銭を投じれば一ポンドも投じる（何かを始めたら結論を出さなければならないという認識を表す）

英語の意味

in for a penny, in for a pound (expressing recognition that one must conclude something after having started it)

Já que começaste este projeto, estás perdido por cem, perdido por mil, então é melhor comprometer-te até ao fim.

このプロジェクトを始めたのなら、始めた以上、やり抜くしかないので、最後まで全力で取り組むべきだ。

Since you have started this project, you're in for a penny, in for a pound, so you might as well commit to seeing it through.