From Wei Wei Nuo Nuo, "Wei" and "Nuo" are two onomatopoeic words in ancient Chinese, both of which are answering voices. Refers to blindly agreeing with others and having no opinion. "Wei" refers to the response of people with low status or seniority to people with high status or seniority; "Promise" refers to the response of people with high status or seniority to subordinates or younger generations. Describe yourself as having no idea, blindly echoing and obeying. Today, this idiom is used to describe a person's humble appearance of grovelling and serving the powerful.