Euthanize (verb)

To put an animal to death humanely, typically to prevent suffering.

Origin:

1930s: from greek eu "good" + thanatos "death".

Examples:

1. The animal shelter decided to euthanize the dog because it was aggressive and dangerous.
2. The veterinarian euthanized the cat because it was suffering from a terminal illness.
3. The animal rights activists protested the decision to euthanize the sick lion.
4. The owner had to euthanize their beloved pet because it was in too much pain.
5. The zoo had to euthanize the old elephant to prevent further suffering.