Even if (one) dies; expressing a strong resolution to do something even at the risk of one's life.
彼は『死んでも君を守る』と言った。
He said, 'I'll protect you even if I die.'
死んでも行かないと約束した場所に連れて行かれた。
He was taken to the place he had promised he would never go even if he died.
あの試験には死んでも合格したいと思っている。
He wants to pass that exam even if it costs him his life.
At all costs; no matter what; definitely — used as a strong emphatic expression of determination.
明日のセールは死んでも行くつもりだ。
I'm going to the sale tomorrow no matter what.
彼女は死んでもその秘密を守ると言った。
She said she'd keep that secret at all costs.
死んでも成功させるとチーム全員が誓った。
The whole team vowed they'd make it succeed no matter what.