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This idiom is often used to describe what a person does is extremely cruel and heartless, completely disregarding the feelings of others, and sometimes even hurting others.
The origin of this idiom can be traced back to ancient times. It first appeared in the preface of The Collection of Mr. into mirror by Xiao Tong, the monarch of Liang Dynasty in the Southern Dynasties. It is said that there was a poet named Tao Qian at that time. His poems are excellent, but because he is aloof, doesn't like to associate with the secular, lives in poverty and is often forced by his livelihood.
Some people think that Tao Qian's poems are too bitter, accusing him of being "heartless" and saying that he has no sympathy and moral bottom line.
However, in fact, the meaning of this idiom is not entirely so. In real life, people often use this idiom to describe those heartless people, not just those who lead miserable lives. Therefore, when we hear someone describe a person as "cruel and heartless", it often means that this person has done heinous things and may even cause great harm to others.
This idiom vividly expresses people's strong indignation at those ruthless and cruel bad behaviors. The reason why this idiom has such a strong emotional color is that it associates the bad behavior of human beings with wolves and dogs, which makes it easier for people to understand and accept the meaning of this idiom.
In real life, wolves and dogs are both aggressive and cruel animals, and they will be very fierce and ruthless when they prey on their prey. Therefore, when people describe a person as cruel and heartless, it shows that this person has the same cruel and heartless characteristics as a wolf and a dog, and is a person with moral corruption and no conscience.
In a word, this idiom is widely used in real life, vividly expressing people's strong indignation at those cruel and heartless people.
By using this idiom, people can express their feelings more accurately and convey strong condemnation of bad behavior. At the same time, this idiom also warns people to maintain good moral quality and be a person with conscience and morality.