verb
to painlessly end the life of a suffering animal or person, typically by lethal injection
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The decision to euthanize a terminally ill patient is a difficult one that must be made with careful consideration.
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The vet had to euthanize our family dog because he was suffering too much.
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I can't believe they euthanized that old car instead of fixing it up.
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In order to save the project, we had to euthanize some of the less important features.