be coquettish
It is a Chinese idiom, Pinyin is s ā ot ó UN ò ngz ī, which originally refers to dressing up; later it describes a woman showing off her beauty (including derogatory meaning). It comes from the biography of Li Gu in the later Han Dynasty.
The origin of Idioms
In the Southern Dynasty, Song Dynasty, Fan Ye's biography of Li Gu in the book of the later Han Dynasty: "the great journey is at the funeral, and passers-by cover their tears. Gu Du Hu whitewashed his appearance, scratched his head and made a pose, hovered and bowed, and took his steps calmly. He never had a miserable heart
Idiom usage
It has a derogatory meaning.
Examples
I love their simple nature, which neither attracts the bees nor makes a fuss. (the chapter of proud frost by Junqing)
be coquettish
Honest and upright officials are hard to judge housework - qīng guān nán duàn jiā wù shì
with dishevelled hair and a dirty face - péng tóu gòu miàn