even if it kills one

even if it kills me / you ({pledging to do something} even if {doing it} is very difficult) — чего бы это ни стоило; любой ценой; ≅ кровь из носу; {в отрицательных предлож.} ни за что на свете, ни в какую

Example: Don't worry. I will get it done even if it kills me. — Не переживай. Я сделаю все, чего бы мне это ни стоило.(McGraw-Hill Dictionary of American Idioms and Phrasal Verbs)

Example: I've got to finish the translation today even if it kills me! — Я должна, кровь из носу, сдать перевод сегодня! (MB)

Example: I have tried to bring that same useful brutality to bear on myself. When I was in high school I was invited to drive to Atlanta with some friends. I'd never traveled without my parents, and before the trip I stayed awake all night, mortally certain that I was going to die on the highway. But I bullied myself into going: people die all the time. Big deal. Who cares if you die? Normal people take trips with their friends, and you are going to act like a normal person even if it kills you. What's your life worth if you can't even do something as simple as this? (American Scholar, 2002)

Example: These last words show the very depth of Quentin's despair laid bare: his father has finally destroyed his only hope, his only reason for living. The only "chivalrous" thing left for him to do, to suffer for his "Lady," has been made worthless. Quentin, still loyal and obedient, can not detach himself from his father's views, even if it kills him. Notice how his sense of "self" is diminished still further, as indicated graphologically. Quentin can not but agree: time will kill his suffering; it will not allow him to fill his life with this great suffering. He must escape time, or else he will ultimately fail here, too. It is this "prospect of ultimate failure" that sets Quentin on the track that leads relentlessly to his suicide. (Ineke Bockting, "The impossible world of the `schizophrenic': William Faulkner's Quentin Compson")

Related vocabulary:
no matter what
(even) if it's the last thing I do