One means "nice eyebrows". But this explanation is quite unreasonable, because "eyebrows look good" is not a patent for women, and thick eyebrows and big eyes have always been one of the selection criteria for handsome guys. Since men and women have equal rights in having beautiful eyebrows, we can't replace women with "beautiful eyebrows".

Another meaning is the causative use of adjectives in ancient Chinese, which means "to make eyebrows beautiful". In other words, it is "trimming eyebrows". In China, it is completely feminine for men to do hair, shave and add white powder and honey to their faces, but it does not include thrush.

In addition, in network language, girls are often used as MM in network language. Because there happens to be a word "beauty" in the word "girl", and eyebrows are one of the most beautiful positions on a woman, "girl" is easily associated with beauty. Over time, when people see "pretty girl", they think it means beauty.