to the last idiom formal
直到最后一刻
until something is complete or has been achieved
I think my position is right, and I'll defend it to the last. 我认为自己的立场没有错，我会坚持到底。
直到死亡
until the end of someone's life
She was a true patriot to the last. 她自始至终都是一位真正的爱国者。