euthanize
verb(British English also euthanise)
(especially North American English)- euthanize somebody/something
to kill a sick or injured animal or person by giving them drugs so that they die without pain 使（人或动物）安乐死 They decided to euthanize those whales that were too ill to return to the sea. 他们决定对那些病得无法返回大海的鲸鱼实施安乐死。 A decision was made to euthanize the cloned sheep. 决定对克隆羊实施安乐死。