даже ценой своей жизни(досл. "(даже) если это последняя вещь(, которую) я (с)делаю": I've been training all my life in this sport. By God, I'm going to win a gold medal if it's the last thing I do!thefreedictionary.comShabe)
из последних сил(A person who is on their last legs is very tired or near to death: We'd been out walking all day and I was on my last legs when we reached the hotel. It looks as though her grandfather's on his last legs. wilson100)