no matter what; under any circumstances; at all costs
Emphatic expression meaning 'whatever happens' or 'no matter what'; often used to express strong determination or inevitability.
どうあっても明日までにこの仕事を終わらせる。
I will finish this work by tomorrow no matter what.
どうあっても彼は自分の意見を曲げないだろう。
He won't change his opinion under any circumstances.
From どう (how) + あっても (even if it is), the て-form of ある (to be) with も (even). Literally 'even if it is how', i.e., 'no matter how it is'.