Looking at the gap
In Chinese, Pinyin is k à nxi á s à x à, which means peeping at each other's gaps. It comes from Xue Fucheng's on the mistake of not being diligent and being far away.
Idiom usage
To look for an opportunity
The origin of Idioms
In Xue Fucheng's on the mistakes of not being diligent and being far away from others in the Qing Dynasty, it is said that "all countries want to seize what we do not fight for, and take advantage of what we are unprepared for
Idiom explanation
Peeping at each other's gaps.
Looking at the gap
take cities and seize territory - gōng chéng lüè dì