成则为王，败则为寇

词语解释

旧指在争夺政权斗争中，成功了的就是合法的，称帝称王；失败了的就是非法的，被称为寇贼。含有成功者权势在手，无人敢责难，失败者却有口难辩的意思。

英语翻译

fig. losers are always in the wrong; lit. called a king if successful, called a bandit if defeated (idiom)