Forget all the other deather nonsense for a second. It's hard, I know. But do it.
Withholding health care from old people is not euthanasia. Nazis killing Jews in concentration camps is not euthanasia. For that matter, killing unwanted but healthy dogs and cats is not euthanasia.
Euthanasia is killing in the deceased's actual best interests. A dog that has been hit by a car, suffers unimaginable pain, and faces a few days of agony before dying can be euthanized if she is killed to relieve her suffering. The soldier on the battlefield, shot in the liver and bleeding out, can be euthanized with an extra shot of morphine. And yes, terminal patients who ask for it can be euthanized through so-called "assisted suicide."
Grandma dying from not getting dialysis because it isn't economical isn't euthanasia, it's just plain murder.
So if Republicans and other various assholes want to accuse Democrats of wanting to straight-up murder people, go for it. Good luck with that. But don't call it euthanasia. Next time real euthanasia is called for to legitimately relieve suffering, the concept will be tainted beyond recognition.