though; even if; whether ... or ...
行くにしろ行かないにしろ連絡してくれ。
Whether you go or not, let me know.
何にしろ急いだ方がいい。
Whatever the case, it's better to hurry.
反対にしろ賛成にしろ意見を聞きたい。
Whether you're against or for it, I want to hear your opinion.