take advantage of sb . 's undefended state to attack
As a Chinese idiom, Pinyin is ch é NGX ū D ǎ ox ì, which means that the words are just to the point. It is compared to percussion. From Lao Can's travels.
The origin of Idioms
Chapter 10 of Lao Can's Travels: "Huang Long raises the chime to strike, and on the chime, he clangs, harmonizes, and takes advantage of the gap."
Idiom usage
To act as a predicate or attributive
take advantage of sb . 's undefended state to attack
a man of distinction always has a poor memory - guì rén duō wàng
demolish with penetrating criticism - biān pì rù lǐ
fallen leaves return to the roots -- to revert to one 's origin - luò yè guī gēn
cherish the old and care for the poor - jìng lǎo lián pín
cut one's feet the procrustean bed - xuē zú shì lǚ
retire with ease and decline to accept a government post - gāo wò dōng shān
said of an elegant demeanor and high personality - yù gǔ bīng jī