at any costを覚えたいです。
"If you have unfinished business, then you should finish it at any cost."
"if ~ then ~" 「〜なら〜」
"you have unfinished business" 「未練が残る」
"you should finish it" 「やり遂げるべきだ」
"at any cost" 「是が否でも」
"You should finish what you started whether you like it or not."
"You should finish ~" 「〜やり遂げるべきだ」
"what you started" 「始まったこと」・「未練が残る」
"whether you like it or not" 「是が否でも」